ok, aeiou, sometimes y and w are vowels. In all the words that you posted the y is a vowel, same as in my mother's name, Kathryn. w is a vowel in pillow. and i hopw i don't have to go into words were aeiou are vowels. there is one word that i can think of that doesnt use aeiouyw, and it is nth, ans in to the nth degree, and it is a word. here is the dictionary.com definition for nth:

nth /?n?/ Pronunciation Key - Show Spelled Pronunciation[enth] Pronunciation Key - Show IPA Pronunciation
–adjective 1. being the last in a series of infinitely decreasing or increasing values, amounts, etc.
2. (of an item in a series of occurrences, planned events, things used, etc., that is thought of as being infinitely large) being the latest, or most recent: This is the nth time I've told you to eat slowly.

so there you go.