semantic relation

NOUN
17 LETTERS · STARTS WITH S

semantic relation is a valid 17-letter word worth 20 points in Scrabble and 25 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
S1E1M3A1N1T1I1C3R1E1L1A1T1I1O1N1
1 + 1 + 3 + 1 + 1 + 1 + 1 + 3 + 0 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 =20 PTS
DOUBLE WORD → 40TRIPLE WORD → 60
MEANING

What does semantic relation mean?