NU
Worth 2 points before any premium square, and the lowest-scoring of the 96 — tied with 35 others.
NU extends into 5 three-letter words, which is the 14th least extendable of 96 — tied with 2 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
- G→GNU
- B→NUB
- N→NUN
- S→NUS
- T→NUT
Not all of them are equally reachable, which a bare count of 5 hides. NU hooks on 5 distinct letters, and the ones you are likeliest to be holding are N (36% of opening racks), T (36% of opening racks) and S (26% of opening racks). The rarest is B, at 14%.
How often you can actually play it
Out of an opening rack, 8.27% of the time you hold the letters for NU outright, the 40th likeliest of 96 — tied with 2 others. Counting a blank as whichever letter is missing lifts that to 14.22%, 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.
It reverses
NU backwards is UN, which is also good. That is how most of this list is actually learned — 46 of the 96 come in reversible pairs, so knowing one gets you the other free.