railroader

NOUN /reɪl,roʊdər/
10 LETTERS · 3 SYLLABLES · STARTS WITH R

railroader is a valid 10-letter word worth 11 points in Scrabble and 12 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
R1A1I1L1R1O1A1D2E1R1
1 + 1 + 1 + 1 + 1 + 1 + 1 + 2 + 1 + 1 =11 PTS
DOUBLE WORD → 22TRIPLE WORD → 33
MEANING

What does railroader mean?