The letters in EXTENDS make 61 words of two letters or more. The longest is EXTENDS at 7 letters, and the highest-scoring is EXTENDS at 15 points.
No other single word uses all 7 letters of EXTENDS. EXTENDS has 7 letters: 2 vowels and 5 consonants, worth 15 points before any board bonuses.
7-letter words 1
6-letter words 3
5-letter words 12
deets6denes6dense6dents6desex13dexes13needs6sente5steed6teens5tends6tense5
4-letter words 24
dees5deet5dene5dens5dent5ends5exes11need5nest4nets4next11seed5seen4send5sene4sent4sext11sned5teds5teed5teen4tees4tend5tens4
3-letter words 13
dee4den4dex11end4ens3nee3net3see3sen3set3ted4tee3ten3
2-letter words 8
de3ed3en2es2et2ex9ne2ts2
Words are from our open word list and include some game-only words. Rude words are left out of this page; the unscrambler shows every valid word, lets you add blank tiles and filter by length.