grape vine vs grapevine

grape vine and grapevine both are nouns.

Word	Noun	Adjective	Verb	Adverb
grape vine	Yes	No	No	No
grapevine	Yes	No	No	No

As nouns, grape vine and grapevine are synonyms defined as:

grape vine and grapevine: any of numerous woody vines of genus Vitis bearing clusters of edible berries

Other synonyms of grape vine include grape.

grape vine (noun)	grapevine (noun)
any of numerous woody vines of genus Vitis bearing clusters of edible berries	gossip spread by spoken communication
	any of numerous woody vines of genus Vitis bearing clusters of edible berries