meld vs grow together

meld is a noun but grow together is not a noun.

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

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

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

meld (noun)	grow together (noun)
a form of rummy using two decks of cards and four jokers; jokers and deuces are wild; the object is to form groups of the same rank

meld (verb)	grow together (verb)
mix together different elements	grow together (of plants and organs)
lose its distinct outline or shape; blend gradually
announce for a score; of cards in a card game