grow together vs meld

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

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

As verbs, meld is a hypernym of grow together; that is, meld is a word with a broader meaning than grow together:

Other hypernyms of grow together include blend, coalesce, combine, commingle, conflate, flux, fuse, immix, merge, mix.

grow together (noun)	meld (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

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