май May (month)
Эй! Hey!
ый normal masc. sg. nom. adjectival ending, always unstressed
бой battle, also normal masc. sg. nom. adjectival ending, always stressed
уй (the only word I can think of is unprintable!) может быть ещё есть суй! (сунуть)
ай-яй-яй
ей "to her", also fem sg. oblique adjectival ending
ий masc. sg. nom. adjectival ending, always unstressed
ёй (пожалуй нет слова такого рода)
Юй (Chinese name, otherwise does not occur in Russian words, I think.)
In Standard Russian the stressed vowels are /a e o i u/. The only unstressed vowels are /a i u/. These vowels have two spellings, depending on the preceding consonant: а/я э/е о/ё ы/и у/ю. Although the unstressed эеo remain spelled ЭЕО, they are pronounced generally as /i/ and /o/. For example экономика is /ikan