DIPNOAN is a playable word

dipnoan Scrabble® Dictionary

noun
pl. dipnoans
a lungfish
70 Playable Words can be made from "DIPNOAN"
   2-Letter Words (16 found)
   3-Letter Words (25 found)
   4-Letter Words (18 found)
   5-Letter Words (8 found)
   6-Letter Words (1 found)
   7-Letter Words (2 found)