The letters in EXISTING make 107 words of two letters or more. The longest is EXISTING at 8 letters, and the highest-scoring is EXISTING at 16 points.
No other single word uses all 8 letters of EXISTING. EXISTING has 8 letters: 3 vowels and 5 consonants, worth 16 points before any board bonuses.
8-letter words 1
7-letter words 3
exiting15ignites8sexting15
6-letter words 9
ignite7ingest7nixies13seniti6sexing14signet7siting7tieing7tinges7
5-letter words 22
exist12exits12genii6gents6gites6inset5intis5neist5nisei5nites5nixes12nixie12segni6sengi6senti5singe6sixte12stein5sting6tines5tinge6tings6
4-letter words 34
egis5engs5exit11gens5gent5gest5gets5gien5gies5gins5gist5gite5gits5inti4nest4nets4next11nisi4nite4nits4nixe11sent4sext11sign5sine4sing5site4snit4tegs5tens4ties4tine4ting5tins4
3-letter words 25
eng4ens3gen4get4gie4gin4git4ins3its3net3nit3nix10seg4sei3sen3set3sin3sit3six10teg4ten3tie3tin3tis3xis10
2-letter words 13
en2es2et2ex9gs3in2is2it2ne2si2ti2ts2xi9
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.