Is “Motto” a Scrabble word?
Yes
MOTTO
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Motto
/ˈmɒtəʊ/
noun
1.A sentence, phrase, or word, forming part of an heraldic achievement.
2.A sentence, phrase, or word, prefixed to an essay, discourse, chapter, canto, or the like, suggestive of its subject matter; a short, suggestive expression of a guiding principle; a maxim.
3.A paper packet containing a sweetmeat, cracker, etc., together with a scrap of paper bearing a motto.