3 letter words with O and I

Our dictionary holds 14 3 letter words with o and i, all exactly 3 letters long. The highest-scoring of them is KOI, worth 7 points in Scrabble.

More of these words begin with O than any other letter — 4 of them, about 29% of the list.

6 appear in the 20,000 most common English words (43%), including oil, iso, bio, ion, ios; the remaining 8 are rarer finds that still count as valid plays.