gibbet vs gallows

gibbet and gallows both are nouns.

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

As nouns, gallows is a hypernym of gibbet; that is, gallows is a word with a broader meaning than gibbet:

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

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

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