diphthongs - Is the 'w' in 'cow' a vowel or a consonant?
Is the w in cow a vowel or a consonant?
Assuming it is considered a vowel, would it likewise be so in how?
I learned that the vowels are "a, e, i, o, u, and sometimes y."
If w can be a vowel, what other letters can be vowels?
What is the definition of a vowel?
By the way, I know w can be a vowel, for example in the word cwm, described in the OED as:
A valley; in Physical Geogr., a bowl-shaped hollow partly enclosed by steep walls lying at the head of a valley or on a mountain slope and formed originally by a glacier; a cirque.
Answer
(See Semivowels in English and When is Y a vowel? for relevant info)
The sounds represented by the letter 'w' in English spelling are somewhat intermediate between consonants and vowels. Sometimes it is closer to a consonant (namely a semivowel or glide because even though 'w' doesn't result in a substantive occlusion in the airstream, there is a restriction of airflow as with the similar glide y. This occurs when the sound (with corresponding letter) appears at the beginning or middle of a word or syllable.
But the letter can also represent a sound that is closer to a vowel when it is part of a diphthong (a double vowel or a vowel followed by a glide, like in the word 'brown').
Which is all to say that the dichotomy of consonant/vowel, while very useful, does not capture the entire complexity of articulation; there are more overlapping categories between a stop (like 'p') and a pure vowel (like 'a').
As to 'cwm', it is a borrowing like the 'll' in 'Lloyd' that represents a non-native (to English) sound and the non-native spelling.
So to summarize for you explicit questions:
- 'w' in 'cow' is a glide (which is considered a consonant (but a sonorant which is closer to a vowel))
- yes, it is the same as in 'how'.
- if 'w' is vowel-like, 'y' is similarly vowel-like.
- a vowel is a sound produced by "no build-up of air pressure at any point above the glottis".
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