nonmalignant tumor

NOUN
18 LETTERS · STARTS WITH N

nonmalignant tumor is a valid 18-letter word worth 22 points in Scrabble and 31 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
N1O1N1M3A1L1I1G2N1A1N1T1T1U1M3O1R1
1 + 1 + 1 + 3 + 1 + 1 + 1 + 2 + 1 + 1 + 1 + 1 + 0 + 1 + 1 + 3 + 1 + 1 =22 PTS
DOUBLE WORD → 44TRIPLE WORD → 66
MEANING

What does nonmalignant tumor mean?