Vowels

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What Are Vowels? (with Examples)

The letters A, E, I, O, and U are called vowels. The other letters in the alphabet are called consonants.
Formal Definition for Vowel

A vowel is classified as "a speech sound produced by a comparatively open configuration of the vocal tract, with vibration of the vocal cords but without audible friction."

More about Vowels

Every Syllable Has a Vowel Sound

A vowel sound (but not necessarily a vowel in the actual spelling) will be present in a syllable.

Interesting Words

Here are some interesting words with regard to their vowels:
  • The word "Iouea" (a genus of sea sponges) contains all five vowels and no other letters.
    • (Being the name of a genus (i.e., a proper noun), it is written with a capital letter. Also of note, it is the shortest word with four syllables.)
  • The words "abstemious" and "facetious" contain all five vowels in order.

Is Y a Vowel?

Using the formal definition above, the letter Y in words like "hymn" and "shy" is also a vowel. However, in words like "beyond" and "yes," Y is a consonant because the breath is partly obstructed.

So, is Y a vowel? Well, sometimes it is, and sometimes it isn't, which is why it is often called a semi-vowel. The argument for classifying Y as a consonant (which most do) is based on this: When Y is a vowel, it is really just an I. When it is a consonant, it is being itself.

vowels and consonants
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A Video Summary

Here is a video summarizing this lesson on vowels.

Short and Long Vowels

In English, the sounds of the vowels are group into two pairs: short vowels and long vowels. The short vowels are pronounced as follows:
  • "a" as in "bat"
  • "e" as in "bed"
  • "i" as in "bit"
  • "o" as in "bog"
  • "u" as in "but"
The long vowels are pronounced as follows:
  • "a" as in "haze"
  • "e" as in "he"
  • "i" as in "hi"
  • "o" as in "hope"
  • "u" as in "human"
Unfortunately for those learning English, these vowel sounds can be created with lots of different spellings. It is even common for a single vowel to create the sound of a different vowel (e.g., the "a" in "any" creates a short "e" sound). Here are some examples:

Some alternative spellings for the short "e" vowel:
  • many
  • bread
  • said
  • leopard
Some alternative spellings for the long "a" vowel:
  • pain
  • prey
  • pray
  • puree
NB: It used to be a common practice to show the short vowels as lowercase letters (aeiuo) and the long vowels are uppercase letters (AEIOU). However, as both sets usually appear as lowercase letters in words, this practice has largely been dropped from teaching materials.

Try our drag-and-drop test on the types of syllable.

Why Should I Care about Vowels?

Here are two good reasons to think more carefully about vowels.

(Reason 1) Be clear on when to use "an" and "a."

Use "an" (not "a") before a vowel sound. The important word here is sound.

Get the Rule Right!


This is the rule:
  • Use 'an' before a vowel sound.
This is NOT the rule:
  • Use 'an' before a vowel.
Knowing when to use "a" and "an" is all about the sound of the next letter. (It is not about whether the next letter is a vowel or a consonant.). Look at these examples:
  • an apple. a apple.
    • ("An" is correct because "apple" starts with a vowel sound (and a vowel for that matter).)
  • an RTA. a RTA
    • ("An" is correct because "RTA" starts with a vowel sound ("ar"), even though the first letter is not a vowel.)
While we're on this subject, it's worth reminding ourselves that the words "an" and "a" are called the indefinite articles.
  • An unidentified man with a unicorn tattoo rented a house an hour ago.
    • (Even though they start with the same three letters, "unidentified" and "unicorn" attract different indefinite articles. Similarly, "hour" attracts "an" while "house" attracts "a." Remember that it's all about the sound of the first letter.)
  • Becoming a eunuch wasn't a one-off deal – it was a two-off deal.
    • ("Eunuch" and "one-off" start with vowels but with consonant sounds.)
Read more using "an" and "a."

(Reason 2) Use assonance to add rhythm and musicality to your writing.

Assonance is a literary technique created by repeating the same vowel sound in neighboring words. It is used by lyricists and poets to encourage their readers and listeners to consider the near rhyme created by the assonance. (NB: Assonance contrasts with consonance, which is a similar literary technique in which nearby words repeat the same consonant sound.)

Here are some examples of assonance:
  • His fleet feet seem impossible to beat.
  • "A host, of golden daffodils" (Extract from "I Wandered Lonely as a Cloud" by poet William Wordsworth)
  • "Hear the mellow wedding bells" (Extract from "The Bells" by American writer Edgar Allen Poe)
Read more about assonance.

Here, for comparison, is an example of consonance:
  • I earn my keep by cracking locks or picking pockets.

Key Points

  • Use "an" if the next word starts with a vowel sound.
  • Use assonance (repetition of the same vowel sound in nearby words) to compel your readers to think more deeply about your word choice.
Ready for the Test?
Here is a confirmatory test for this lesson.

This test can also be:
  • Edited (i.e., you can delete questions and play with the order of the questions).
  • Printed to create a handout.
  • Sent electronically to friends or students.

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See Also

What are consonants? What is assonance? What is consonance? Using "an" or "a" with consonants Drag-and-drop test on the types of syllable Glossary of grammatical terms