principal parts

15 LETTERS · STARTS WITH P

principal parts is a valid 15-letter word worth 22 points in Scrabble and 28 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

P3R1I1N1C3I1P3A1L1P3A1R1T1S1

3 + 1 + 1 + 1 + 3 + 1 + 3 + 1 + 1 + 0 + 3 + 1 + 1 + 1 + 1 =22 PTS

DOUBLE WORD → 44TRIPLE WORD → 66

MEANING

What does principal parts mean?