Yes, mammy is a Scrabble word!
...and is worth 14 points in Scrabble, and 16 points in Words with Friends
mammy
Noun
1. An offensive term for a Black nursemaid in the southern U.S.
2. Informal terms for a mother
What Scrabble words can I make with the letters in mammy?
3 Letter Words
2 Letter Words
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Words that can be created with an extra letter added to mammy:
E:mammey