What It Scores
ECU is a valid word in the tournament list this site uses. Tile values only, before any premium square: 5 in Scrabble and 7 in Words With Friends. The letters break down as E1 C3 U1.
Anagrams of ECU (1)
Same letters, different order. Any of these plays the same tiles for the same score.
Longer Words Containing ECU
ECU appears inside each of these, which is what makes it worth knowing as a hook.
BARBECUEBARBECUEDBARBECUERBARBECUERSBARBECUESBARBECUINGBECUDGELBECUDGELEDBECUDGELSBECURLBECURLEDBECURLINGBECURLSBECURSEBECURSEDBECURSESBECURSINGBECURSTBLUECURLSCAECUMCARDECUCARDECUECARDECUESCARDECUSCECUMCECUTIENCYCOEXECUTORDECUBITALDECUBITIDECUBITUSDECUMANDECUMANSDECUMBENCEDECUMBENCYDECUMBENTDECUPLEDECUPLEDDECUPLESDECUPLINGDECURIA
Next: the Word Unscrambler for any letters at all, and the two and three letter lists. Full entry and definition at Merriam-Webster.