publishing house

NOUN
16 LETTERS · STARTS WITH P

publishing house is a valid 16-letter word worth 26 points in Scrabble and 31 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
P3U1B3L1I1S1H4I1N1G2H4O1U1S1E1
3 + 1 + 3 + 1 + 1 + 1 + 4 + 1 + 1 + 2 + 0 + 4 + 1 + 1 + 1 + 1 =26 PTS
DOUBLE WORD → 52TRIPLE WORD → 78
MEANING

What does publishing house mean?