merge vs grow together

merge and grow together both are verbs.

Word	Noun	Adjective	Verb	Adverb
merge	No	No	Yes	No
grow together	No	No	Yes	No

As verbs, grow together is a hyponym of merge; that is, grow together is a word with a more specific, narrower meaning than merge:

Other hyponyms of merge include gauge, absorb, meld, melt, blend in, mix in, accrete, conjugate, admix, alloy, syncretise, syncretize.

merge (verb)	grow together (verb)
become one	grow together (of plants and organs)
mix together different elements
join or combine