Unscrambling OPERATION gives 339 words. OPERATION is the longest, and OPERATION scores the most at 11 points.
No other single word uses all 9 letters of OPERATION. OPERATION has 9 letters: 5 vowels and 4 consonants, worth 11 points before any board bonuses.
9-letter words 1
8-letter words 1
atropine10
7-letter words 14
atropin9operant9oration7painter9patroon9pertain9pointer9portion9pronate9pronota9protean9protein9repaint9tropine9
6-letter words 39
5-letter words 71
antre5aport7apron7apter7arpen7atone5atrip7entia5inapt7inept7inert5inter5intro5irate5irone5netop7niter5nitre5nitro5noria5noter5oaten5oater5oorie5opera7opine7orate5orpin7paeon7paint7panto7pareo7paten7pater7patin7patio7peart7piano7pieta7pinot7pinta7pinto7piton7point7poori7prate7print7prion7prone7ratio5repin7repot7retia5riant5ripen7taper7tapir7tenia5tenor5terai5tinea5toner5toper7topoi7train5trine5tripe7trona5trone5troop7trope7
4-letter words 108
aeon4aero4airn4airt4ante4anti4aper6atop6earn4etna4inro4into4iota4iron4naoi4nape6neap6near4neat4nipa6nite4noir4nope6nori4nota4note4onto4open6pain6pair6pane6pant6pare6part6pate6pean6pear6peat6pein6pent6peon6peri6pert6pian6pier6piet6pina6pine6pint6pion6pirn6pita6poet6pone6poon6poor6pore6port6prao6prat6proa6rain4rani4rant4rapt6rate4rato4reap6rein4rent4repo6riot4ripe6rite4roan4root4rope6rota4rote4roti4roto4tain4tape6tare4tarn4taro4tarp6tear4tepa6tern4tier4tine4tire4tiro4toea4tone4toon4tope6topi6tora4tore4tori4torn4toro4trap6trio4trip6trop6
3-letter words 79
ain3air3ait3ane3ani3ant3ape5apt5are3art3ate3ear3eat3eon3era3ern3ert3eta3ion3ire3nae3nap5net3nip5nit3noo3nor3not3oar3oat3one3oot3ope5opt5ora3ore3ort3pan5par5pat5pea5pen5per5pet5pia5pie5pin5pit5poe5poi5pot5pro5ran3rap5rat3rei3rep5ret3ria3rin3rip5roe3roo3rot3tae3tan3tao3tap5tar3tea3ten3tie3tin3tip5toe3ton3too3top5tor3
2-letter words 26
ae2ai2an2ar2at2en2er2et2in2it2na2ne2no2oe2oi2on2oo2op4or2pa4pe4pi4re2ta2ti2to2
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.