Yes, mews is a Scrabble word!

Verb

1. Cry like a cat

2. Utter a high-pitched cry, as of seagulls

Noun

1. Street lined with buildings that were originally private stables but have been remodeled as dwellings

2. The sound made by a cat (or any sound resembling this)

3. The common gull of Eurasia and northeastern North America