Yes, twin is a Scrabble word!

Verb

1. Duplicate or match

2. Bring two objects, ideas, or people together

3. Grow as twins

4. Give birth to twins

Adjective

1. Being two identical

Noun

1. Either of two offspring born at the same time from the same pregnancy

2. (astrology) a person who is born while the sun is in Gemini

3. A waterfall in the Snake River in southern Idaho

4. A duplicate copy