Yes, motley is a Scrabble word!

Verb

1. Make something more diverse and varied

2. Make motley; color with different colors

Adjective

1. Consisting of a haphazard assortment of different kinds

2. Having sections or patches colored differently and usually brightly

Noun

1. A collection containing a variety of sorts of things

2. A garment made of motley (especially a court jester's costume)

3. A multicolored woolen fabric woven of mixed threads in 14th to 17th century England