Q-without-U (the ones every Scrabble player should know)

QI (11 points, TWL and SOWPODS). The vital force in Chinese philosophy. Reliably ends bad racks.

QAT (12, TWL and SOWPODS). A flowering plant chewed as a mild stimulant.

QOPH (16, TWL and SOWPODS). The nineteenth letter of the Hebrew alphabet. Big score on a small rack.

QI‘s plurals: QIS (12, TWL and SOWPODS). QAT‘s plural: QATS (13).

SOWPODS also accepts QADI, QOPHS, QANAT and a few more. TWL is stricter here.

Common Q with U words worth remembering

QUIZ (22), QUAY (16), QUART (14), QUARTZ (24), QUEEN (14), QUICK (20), QUIET (14), QUILL (14), QUAKE (16), QUIET (14). Most short Q-with-U words score in the mid-teens and up.

Strategy note

The Q is a burden if you cannot play it. Two rules of thumb: keep a U on your rack when the Q is in the bag, and if you draw the Q late, get rid of it fast (QI, QAT, or a swap). A Q played on a triple-letter square scores 30 for the tile alone, more if the whole word lands on a premium.