Yes, joins is a Scrabble word!
...and is worth 12 points in Scrabble, and 15 points in Words with Friends
joins
Verb
1. Become part of; become a member of a group or organization
2. Cause to become joined or linked
3. Come into the company of
4. Make contact or come together
5. Be or become joined or united or linked
Noun
1. The shape or manner in which things come together and a connection is made
2. A set containing all and only the members of two or more given sets
What Scrabble words can I make with the letters in joins?
4 Letter Words
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2 Letter Words
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Words that can be created with an extra letter added to joins:
T:joints