QIN​12
QIS​12
Across all available dictionaries on WordsRated, there are a total of two 3-letter words that start with QI.
Knowing some of these words can be particularly useful in a tight game of Scrabble or Words With Friends. In fact, knowing 3 letter words in general can be very useful, and while you have QI, knowing all words that start with QI from the dictionary isn’t a bad idea either.