The letters in SINCERELY make 237 words of two letters or more. The longest is SINCERELY at 9 letters, and the highest-scoring is SINCERELY at 14 points.
No other single word uses all 9 letters of SINCERELY. SINCERELY has 9 letters: 3 vowels and 6 consonants, worth 14 points before any board bonuses.
9-letter words 1
8-letter words 3
licenser10reclines10silencer10
7-letter words 13
ceilers9ceresin9clerisy12crenels9license9liernes7recline9relines7scenery12selenic9silence9sincere9yeelins10
6-letter words 34
ceiler8celery11censer8cerise8clines8creels8crenel8cresyl11eerily9enisle6ensile6eyries9lierne6liners6linsey9lycees11lyrics11lysine9nereis6nicely11nieces8relics8relies6reline6resile6resiny9screen8secern8seiner6senile6serein6serine6slicer8yeelin9
5-letter words 56
ceils7cense7ceres7cines7cires7cline7creel7crees7cries7crine7ernes5eyers8eyres8eyrie8leers5leery8lenes5lenis5lense5liens5liers5liner5lines5liney8lycee10lyres8lyric10lysin8nicer7niece7reels5reins5relic7renes5resin5rices7riels5riles5riley8rinse5risen5scene7scree7seely8seine5serin5since7siree5siren5slice7slier5slyer8sneer5sycee10syren8yince10
4-letter words 69
cees6ceil6cels6cere6cine6cire6cree6cris6eels4eely7eery7else4erne4erns4eyen7eyer7eyes7eyne7eyre7ices6inly7ires4isle4leer4lees4leis4lens4leys7lice6lien4lier4lies4line4lins4liny7lire4lyes7lyre7lyse7nice6nils4recs6reel4rees4rein4reis4rely7rice6riel4rile4rins4rise4ryes7scry9seel4seen4seer4sene4sere4sice6sine4sire4snye7syce9syli7sync9syne7yens7yins7
3-letter words 46
cee5cel5cis5cry8eel3els3ens3ere3ern3ers3eye6ice5icy8ins3ire3lee3lei3ley6lie3lin3lis3lye6nee3nil3rec5ree3rei3res3rin3rye6sec5see3sei3sel3sen3ser3sic5sin3sir3sly6sri3syn6yen6yer6yes6yin6
2-letter words 15
cs4el2en2er2es2in2is2li2ln2ls2ne2re2rs2si2ye5
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.