The letters in OPTIONAL make 151 words of two letters or more. The longest is OPTIONAL at 8 letters, and the highest-scoring is OPTIONAL at 10 points.
No other single word uses all 8 letters of OPTIONAL. OPTIONAL has 8 letters: 4 vowels and 4 consonants, worth 10 points before any board bonuses.
8-letter words 1
7-letter words 1
platoon9
6-letter words 8
5-letter words 24
aloin5inapt7lapin7nopal7notal5paint7panto7patin7patio7piano7pilot7pinot7pinta7pinto7piton7plain7plait7plant7point7polio7talon5tolan5tonal5topoi7
4-letter words 51
alit4alto4anil4anti4atop6into4iota4lain4lati4lino4lint4lion4loan4loin4loon4loop6loot4lota4loti4nail4naoi4nipa6noil4nolo4nota4olio4onto4opal6pail6pain6pant6pial6pian6pina6pint6pion6pita6plan6plat6plot6polo6pool6poon6tail4tain4tali4toil4tola4tool4toon4topi6
3-letter words 45
ail3ain3ait3alp5alt3ani3ant3apt5ion3lap5lat3lin3lip5lit3loo3lop5lot3nap5nil3nip5nit3noo3not3oat3oil3oot3opt5pal5pan5pat5pia5pin5pit5poi5pol5pot5tan3tao3tap5til3tin3tip5ton3too3top5
2-letter words 21
ai2al2an2at2in2it2la2li2ln2lo2na2no2oi2on2oo2op4pa4pi4ta2ti2to2
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.