gallows-tree vs gallows tree

gallows-tree and gallows tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
gallows-tree	Yes	No	No	No
gallows tree	Yes	No	No	No

As nouns, gallows-tree and gallows tree are synonyms defined as:

Other synonyms of gallows-tree include gallous, gibbet.

gallows-tree (noun)	gallows tree (noun)
alternative terms for gallows	alternative terms for gallows