Yes, byword is a Scrabble word!
...and is worth 15 points in Scrabble, and 15 points in Words with Friends
byword
Noun
1. A condensed but memorable saying embodying some important fact of experience that is taken as true by many people
What Scrabble words can I make with the letters in byword?
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Words that can be created with an extra letter added to byword:
S:bywords