jailer vs keeper

jailer and keeper both are nouns.

Word	Noun	Adjective	Verb	Adverb
jailer	Yes	No	No	No
keeper	Yes	No	No	No

As nouns, keeper is a hypernym of jailer; that is, keeper is a word with a broader meaning than jailer:

Other hypernyms of jailer include law officer, lawman, peace officer.

jailer (noun)	keeper (noun)
someone who guards prisoners	one having charge of buildings or grounds or animals
	someone in charge of other people