Which letters are consonants?

There are 21 consonant letters in the English alphabet: B, C, D, F, G, H, J, K, L, M, N, P, Q, R, S, T, V, W, X, Y, and Z. In many words, Y behaves like a consonant at the start of the word.

Why does every word need a vowel?

Every English syllable needs at least one vowel sound because vowels form the core, or nucleus, of the syllable. Without a vowel sound, we cannot clearly pronounce or hear a syllable.

Vowels and Consonants: What Is the Difference?

Q: What are vowels and consonants?

Vowels are speech sounds made with an open mouth and free airflow. The vowel letters are a, e, i, o, u, and sometimes y. Consonants are sounds where the airflow is blocked or narrowed by the lips, teeth, or tongue. All the other letters in the alphabet are consonants.

Q: Which letters are vowels?

In English, the main vowel letters are A, E, I, O, and U. The letter Y sometimes acts as a vowel, especially at the end or in the middle of words like my, gym, and happy.

What Are Vowels and Consonants?

Vowels are speech sounds made with an open mouth and free airflow. In English, the vowel letters are A, E, I, O, U, and sometimes Y. Consonants are sounds where the airflow is blocked or narrowed by the lips, teeth, or tongue; all the other letters are consonants.

When you say a vowel sound like ah or ee, your mouth stays open and the sound flows smoothly. When you say a consonant like p, t, or s, some part of your mouth briefly blocks the air to create a different kind of sound.

Two Groups of Letters in the Alphabet

🟢 Vowels

Vowels are open-mouth sounds and form the center of each syllable.

Letters: A, E, I, O, U (and sometimes Y)
Example sounds: /a/ as in apple, /e/ as in egg, /o/ as in on
Every syllable needs at least one vowel sound.

🟠 Consonants

Consonants are sounds made with the mouth partly closed, blocking or squeezing the air.

Letters: all other letters (B, C, D, F, G, H, J, K, L, M, N, P, Q, R, S, T, V, W, X, Y, Z)
Examples: b in ball, t in top, s in sun
Consonants usually surround vowels in a syllable.

Which Letters Are Vowels? Which Are Consonants?

In the English alphabet, the vowel letters are: A, E, I, O, U, and sometimes Y. All the other letters are consonants.

Vowels: A, E, I, O, U, (Y)
Consonants: B, C, D, F, G, H, J, K, L, M, N, P, Q, R, S, T, V, W, X, Y, Z

If you want to focus just on vowel letters and vowel sounds, read our main guide What Are Vowels? next.

Key Takeaways

This page answers the main keyword clearly, then points readers to the most useful related vowel lessons.

Start with the main definition and examples.
Use the internal links to continue in a logical learning order.
Move from basic vowel knowledge to more advanced spelling patterns.

Vowels vs. Consonants in Words

Vowels and consonants work together to build words. The vowel sits in the middle of the syllable; consonants usually appear at the beginning and end.

Word	Letters	Vowels	Consonants
cat	C‑A‑T	A	C, T
dog	D‑O‑G	O	D, G
sun	S‑U‑N	U	S, N
tree	T‑R‑E‑E	E, E	T, R
book	B‑O‑O‑K	O, O	B, K
my	M‑Y	Y (vowel sound /ī/)	M

Notice that every example above contains at least one vowel letter. Even words where Y is the only vowel letter, like my, still have a vowel sound.

Is Y a Vowel or a Consonant?

The letter Y is special because it can act as a vowel or a consonant, depending on the word.

Y as a consonant: at the start of a word with a “yuh” sound, as in yes, yellow, and yell.
Y as a vowel: in the middle or at the end of a word, where it stands for a vowel sound, as in my, try, gym, and happy.

Teachers sometimes say “A, E, I, O, U… and sometimes Y” to help children remember that Y changes its job.

Why Do Vowels and Consonants Matter?

Understanding vowels and consonants helps children read, spell, and break words into syllables more easily.

🧱 They are the building blocks of words. Every word is made by joining vowel and consonant sounds together.
🗣️ Every syllable needs a vowel sound. This rule helps children check their spelling: if a word has no vowel, something is missing.
📖 They support reading fluency. Knowing which letters are vowels or consonants makes it easier to decode new words and read smoothly.
✏️ They guide spelling patterns. Many phonics rules, such as short and long vowels or syllable types, depend on the pattern of vowels and consonants.

Once kids can tell vowels and consonants apart, they are ready to learn short and long vowel sounds and more advanced phonics patterns.

Tips for Teaching Vowels and Consonants

Parents and teachers can use simple activities to help kids remember which letters are vowels and which are consonants.

Sort the alphabet: write all 26 letters on cards, then have children sort them into “vowel” and “consonant” piles.
Highlight vowels in words: when reading, lightly underline or color the vowels so kids can see how every word uses them.
Play vowel–consonant games: say a letter, and ask children to call out “vowel!” or “consonant!”. Mix in Y to keep it interesting.
Connect to syllables: clap out syllables in words and point to the vowel letter in each part to show that every syllable has a vowel.

Vowels and Consonants