Some words ending in the vowel O are:
If u mean starts with a vowel and ends in a vowel, then Avalanche?
'a', 'asthma' (I know it has two but if it's a riddle you're talking about, it will try to trick you; 'a' and 'a' are the same vowel)
'Example' has 3 syllables and ends with a vowel.
Iguana is a small lizard that ends with a vowel.
One example of a noun that ends in a vowel and "y" is "alley."
technically careful is not a base word, the base of careful is care, which ends in a vowel.
A closed syllable only has one vowel and the syllable ends in a consonant. An example is "sock".
add the suffix
Syllables, by definition, contain vowels. If the syllable ends in a vowel sound, it is open. If it ends in a consonant sound, it is closed.
a word that have only one vowel and ends with that word.................................
The word "rhythm" does not have a vowel, or end in the letter y.
asthma