How many consonants are in the English alphabet?
The traditional answer is 19 with Y sometimes being a consonant and sometimes being a vowel.
However, early educators taught that W was a vowel when not at the beginning of a word, for example when used in the diphthongs OW, AW and EW. Dr. Webster took this one step further and considered W a vowel at all times, so WA would be considered a diphthong which made the wô sound like in the words want, water and waddle. The spelling rules in this card deck consider W to always be a vowel.