Unscrambling PARALLEL gives 58 words. PARALLEL is the longest, and PARALLEL scores the most at 10 points.
No other single word uses all 8 letters of PARALLEL. PARALLEL has 8 letters: 3 vowels and 5 consonants, worth 10 points before any board bonuses.
8-letter words 1
6-letter words 3
earlap8paella8paleal8
5-letter words 6
areal5lapel7palea7paler7parle7pearl7
4-letter words 19
alae4alar4aper6area4earl4lall4leal4leap6lear4pale6pall6para6pare6peal6pear6plea6rale4real4reap6
3-letter words 19
aal3ala3ale3all3alp5ape5are3ear3ell3era3lap5lar3lea3pal5par5pea5per5rap5rep5
2-letter words 10
aa2ae2al2ar2el2er2la2pa4pe4re2
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.