Wondering Why Vocabulary Is Important? Here’s What Science Tells Us

You know that moment when you’re reading aloud to your class, and you hit a word that makes half your students scrunch up their faces in confusion? We’ve all been there!

Just the other day, I was working with a teacher who had this exact experience with the word “crampon” during a mountain climbing story. Some kids lit up (thanks, family hiking trips!), while others were totally lost. It’s moments like these that really drive home why vocabulary is important in ways we might not always think about.

Here’s the Thing About Vocabulary…

I love how Doug Fisher puts it (and trust me, I could talk about his work all day!): “We don’t learn words in isolation. We learn concepts, and vocabulary are the labels for those concepts.” Doesn’t that just click? Understanding why vocabulary is important starts with recognizing that words are really just containers for meaning.

Think about it this way: When your kiddos hear the word “train,” what pops into their minds? I was in a first-grade classroom last week, and we got everything from Thomas the Tank Engine to potty training (yes, really!). Each child’s understanding was completely different based on their experiences.

That’s exactly why the National Reading Panel tucked vocabulary right into their comprehension chapter – you really can’t have one without the other.

Let’s Talk About Background Knowledge (Don’t Roll Your Eyes!)

Here’s what gets me excited when explaining why vocabulary is important – it’s actually a sneaky way to build knowledge. Every new word is like adding another piece to a puzzle that helps kids understand their world better.

I saw this in action recently during a conversation with a colleague. A second-grade teacher was tackling weather vocabulary, and something magical happened. Once her students really got what “precipitation” meant, suddenly words like “drizzle,” “downpour,” and “shower” started making sense too. One little guy even started correcting his mom’s weather reports at home!

Understanding why vocabulary is important clicked for this teacher when she saw how one solid concept could unlock a whole family of related words.

why vocabulary is important

Making This Work in Your Actual, Real-Life Classroom

Okay, let’s get practical. How do we make this happen without losing our minds (or our prep periods)? Here are some ideas that I’ve seen work in real classrooms, with real teachers, and real kids – because understanding why vocabulary is important is one thing, but making it work in your classroom is another!

Text Sets Are Your Friend: Group those readings around topics your kids care about. One third-grade teacher I work with created a space exploration set, and oh my goodness – the vocabulary growth was incredible! Why? Because each text built on the last one, and the words kept showing up in new contexts. That’s why vocabulary is important – it builds on itself when we give it the right environment.

Smart Pre-teaching (Not the Boring Kind): Yes, research shows pre-teaching vocabulary helps. But please, put those flash cards down! Instead, try this: Before reading about volcanoes, have kids share what they already know about “eruptions.” The conversations I’ve heard doing this are pure gold. One of my teachers calls these “word warm-ups,” and her kids can’t wait to share what they know.

Play with Multiple Meanings: Take a word like “dusting” – it means something totally different when you’re talking about cookies versus snow versus furniture. Understanding why vocabulary is important includes helping kids see how flexible words can be. One fourth-grade teacher I know turns this into a quick morning meeting game, and her kids eat it up!

Make It Interactive: Get those words into their speaking and writing. Have kids be “word detectives” looking for ways to use new vocabulary. The pride on their faces when they catch these words in the wild? Priceless! This is why vocabulary is important – it’s not just about reading, it’s about communicating.

Let’s Wrap This Up (Because I Know You Have Lessons to Prep)

You know what I love most about focusing on why vocabulary is important? It’s that moment when you see a student connect the dots. When they not only recognize a word but really get it. That’s not just vocabulary growth – that’s building a stronger reader right before your eyes.

Because here’s the truth about why vocabulary is important: it’s not just about words. It’s about opening doors to understanding, building confidence, and helping our kids become the kinds of readers who dive into texts fearlessly.

Every time we help a student truly understand a new word, we’re not just teaching vocabulary – we’re building their confidence as readers and learners. After all, watching kids light up when they truly understand what they’re reading – that’s why we do this work in the first place. Keep being amazing, teacher friends!

My Mission is Simple

Give teachers the science-backed tools they need to help every student become a confident reader.
I’m so glad you’re here! 

Give me the Quiz!

Feeling Stuck?

You’ve noticed something isn’t quite right. A student who struggles during read-alouds, avoids writing, or works twice as hard for half the results. Your instincts are telling you something – but what’s next? Download my free 5 Silent Signs of Reading Struggle to identify what you’re seeing and know exactly what to do about it.

Additional Resources

When fellow teachers ask what’s helped shape my approach to literacy, these are some of the books I find myself recommending—practical companions that translate research into Monday-morning-ready strategies.

As an Amazon Associate, I earn from qualifying purchases.

How to Develop Vocabulary
Science of Reading

How to Develop Vocabulary: Teaching Beyond Your Weekly Lists

Hey there! Can I share something that happened in a third-grade classroom last week? I was sitting with a teacher during her planning time, and I could see the frustration in her eyes. “I feel like I’m spinning my wheels with vocabulary,” she confided. “We have our word wall, we practice definitions, we do the whole routine… but the words just aren’t sticking.”

Read More »
what is etymology
Science of Reading

What Is Etymology? The Story Behind Every Word We Teach

The other day, a teacher in my building stopped me in the hallway with an interesting question. “My students keep asking about word origins, and I realize I’m not quite sure how to explain what is etymology in a way that makes sense to them.” It’s one of my favorite questions to answer, because understanding what is etymology can transform the way we teach vocabulary.

Read More »
what is morphology
Science of Reading

What is Morphology? Your Secret Weapon for Building Strong Readers

You know that moment when a student gets stuck on a long word and their whole body tenses up? I see it all the time in the classrooms I support, and honestly, it breaks my heart a little. But here’s the thing – I’ve got something in my teaching toolkit that’s been a total confidence-builder for my struggling readers, and I can’t wait to share it with you.

Read More »

Grab your free lesson plan!

You're Just a Click Away!