gallows tree vs gallous

gallows tree and gallous both are nouns.

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

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

Other synonyms of gallows tree include gallows-tree, gibbet.

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