gallows vs gibbet

gallows and gibbet both are nouns.

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

As nouns, gibbet is a hyponym of gallows; that is, gibbet 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
gibbet: alternative terms for gallows

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

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

gallows (verb)	gibbet (verb)
	hang on an execution instrument
	expose to ridicule or public scorn