LENGTHEN is a playable word

lengthen Scrabble® Dictionary

verb
lengthened, lengthening, lengthens
to make or become longer
55 Playable Words can be made from "LENGTHEN"
   2-Letter Words (7 found)
   3-Letter Words (21 found)
   4-Letter Words (16 found)
   5-Letter Words (7 found)
   6-Letter Words (3 found)
   8-Letter Words (1 found)