UP
Worth 4 points before any premium square, and the 34th highest-scoring of 96 — tied with 18 others.
UP extends into 9 three-letter words, which is the 43rd least extendable of 96 — tied with 8 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
- C→CUP
- D→DUP
- H→HUP
- P→PUP
- S→SUP
- T→TUP
- Y→YUP
- O→UPO
- S→UPS
Not all of them are equally reachable, which a bare count of 9 hides. UP hooks on 8 distinct letters, and the ones you are likeliest to be holding are O (45% of opening racks), T (36% of opening racks) and D (26% of opening racks). The rarest is Y, at 14%.
How often you can actually play it
Out of an opening rack, 3.06% of the time you hold the letters for UP outright, the 12th least likely of 96 — tied with 4 others. Counting a blank as whichever letter is missing lifts that to 7.41%, 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.