Yes, lesser is a Scrabble word!
...and is worth 6 points in Scrabble, and 7 points in Words with Friends
lesser
Adjective
1. Of less size or importance
2. Smaller in size or amount or value
3. (comparative of `little' usually used with mass nouns) a quantifier meaning not as great in amount or degree
4. (usually preceded by `no') lower in quality
5. (nonstandard in some uses but often idiomatic with measure phrases) fewer
What Scrabble words can I make with the letters in lesser?
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words