go together

Short definition from Wiktionary

Verb

1. 1
   To be in a relationship.
2. 2
   To accompany each other (e.g. to an event).
3. 3
   To correspond or fit well.
4. 4
   To be inseparable; to go hand in hand.

Noun

1. 1
   One of two or more objects that match, or combine well.