ID
Worth 3 points before any premium square, and the 44th lowest-scoring of 96 — tied with 7 others.
ID extends into 12 three-letter words, which is the 36th most extendable of 96 — tied with 4 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
- A→AID
- B→BID
- D→DID
- F→FID
- G→GID
- H→HID
- K→KID
- L→LID
- M→MID
- R→RID
- Y→YID
- S→IDS
Not all of them are equally reachable, which a bare count of 12 hides. ID hooks on 12 distinct letters, and the ones you are likeliest to be holding are A (49% of opening racks), R (36% of opening racks) and D (26% of opening racks). The rarest is K, at 7%.
How often you can actually play it
Out of an opening rack, 11.48% of the time you hold the letters for ID outright, the 26th likeliest of 96 — tied with 7 others. Counting a blank as whichever letter is missing lifts that to 18.38%, 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.