The letters in DELIVERY make 151 words of two letters or more. The longest is DELIVERY at 8 letters, and the highest-scoring is DELIVERY at 15 points.
No other single word uses all 8 letters of DELIVERY. DELIVERY has 8 letters: 3 vowels and 5 consonants, worth 15 points before any board bonuses.
8-letter words 1
7-letter words 6
6-letter words 21
delver10derive10direly10drivel10eerily9eviler9eyelid10levied10levier9lieder7liever9livery12livyer12reived10relied7relive9revile9ridley10veiled10veiler9verily12
5-letter words 33
delve9devel9devil9diver9drily9drive9edile6eider6elder6elide6elver8ervil8every11eyrie8idler6leery8lever8lieve8lived9liver8livre8redly9redye9reedy9reive8revel8riled6riley8rived9veery11verey11viler8yield9
4-letter words 51
deer5deil5dele5deli5dere5derv8diel5dire5dirl5dive8dree5dyer8eely7eery7eide5ever7evil7eyed8eyer7eyre7idle5idly8idyl8ired5leer4levy10lied5lier4lire4live7lyre7rede5reed5reel4rely7ride5riel4rile4rive7veer7veil7veld8very10vide8vied8vier7vile7vire7virl7yeld8yird8
3-letter words 31
dee4del4dev7dey7die4dry7dye7eel3eld4ere3eve6eye6ire3ivy9led4lee3lei3lev6ley6lid4lie3lye6red4ree3rei3rev6rid4rye6vee6vie6yer6
2-letter words 8
de3ed3el2er2id3li2re2ye5
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.