The letters in EXTERNAL make 148 words of two letters or more. The longest is EXTERNAL at 8 letters, and the highest-scoring is EXTERNAL at 15 points.
No other single word uses all 8 letters of EXTERNAL. EXTERNAL has 8 letters: 3 vowels and 5 consonants, worth 15 points before any board bonuses.
8-letter words 1
7-letter words 4
enteral7eternal7exalter14teleran7
6-letter words 11
5-letter words 36
alert5alter5anele5antre5arete5artel5eaten5eater5elate5enate5enter5exalt12exeat12exert12extra12laree5laten5later5latex12laxer12leant5learn5neral5ranee5ratel5relax12relet5renal5rente5retax12taler5taxer12telae5telex12terne5treen5
4-letter words 38
alee4ante4axel11axle11earl4earn4elan4erne4etna4lane4late4lean4lear4leer4leet4lent4near4neat4next11rale4rant4rate4real4reel4rent4rete4tael4tale4tare4tarn4teal4tear4teel4teen4tela4tele4tern4tree4
3-letter words 40
ale3alt3ane3ant3are3art3ate3axe10ear3eat3eel3era3ere3ern3ert3eta3lar3lat3lax10lea3lee3let3lex10nae3nee3net3ran3rat3rax10ree3ret3rex10tae3tan3tar3tax10tea3tee3tel3ten3
2-letter words 18
ae2al2an2ar2at2ax9el2en2er2et2ex9la2ln2lx9na2ne2re2ta2
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.