PA
Worth 4 points before any premium square, and the 34th highest-scoring of 96 — tied with 18 others.
PA extends into 14 three-letter words, which is the 19th most extendable of 96 — tied with 10 others. That is the number worth memorising: a two-letter word is a place to put tiles, but a well-hooked one is a place to put them where the board stays open.
Every hook
- S→SPA
- C→PAC
- D→PAD
- H→PAH
- L→PAL
- M→PAM
- N→PAN
- P→PAP
- R→PAR
- S→PAS
- T→PAT
- W→PAW
- X→PAX
- Y→PAY
Not all of them are equally reachable, which a bare count of 14 hides. PA hooks on 13 distinct letters, and the ones you are likeliest to be holding are N (36% of opening racks), R (36% of opening racks) and T (36% of opening racks). The rarest is X, at 7%.
How often you can actually play it
Out of an opening rack, 6.06% of the time you hold the letters for PA outright, the 44th least likely of 96 — tied with 15 others. Counting a blank as whichever letter is missing lifts that to 12.69%, though spending one of the two blanks on a two-letter word is rarely the play. Exact hypergeometrics over the 100-tile bag, not a simulation.