gallows vs gallous

gallows and gallous both are nouns.

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

As nouns, gallous is a hyponym of gallows; that is, gallous is a word with a more specific, narrower meaning than gallows:

gallows: an instrument of execution consisting of a wooden frame from which a condemned person is executed by hanging
gallous: alternative terms for gallows

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

gallows (noun)	gallous (noun)
an instrument of execution consisting of a wooden frame from which a condemned person is executed by hanging	alternative terms for gallows