Russian's probably got more one letter words than any other language.

You got some splainin' to do. It's been a lotta years since I took Russian, but I recall only one one-letter word, even though the Russian alphabet consists of 33 letters: 21 consonants, 10 vowels, and two letters without sound - soft sign and hard sign.

Taking them alphabetically:

A: conj. but, and, or; interj. ah!

B: gram. (used with the conditional and subjunctive moods); should, would; may, might

V: prep. in

I: conj. and; but; although

K: prep. to, towards; by; for

O: prep. about, concerning, of

S: prep, with; from, since

U: prep. at, by, to; close by, close to, near

Ya: pron. I

NB: Some of these may have two or three letter variants. This does not mean that they are not one letter words. Also note that the last entry appears to be two letters only because it is the transliteration of a single Russian character. It's the famous backwards R.