slammer vs closer

slammer and closer both are nouns.

Word	Noun	Adjective	Verb	Adverb
slammer	Yes	No	No	No
closer	Yes	No	No	Yes

As nouns, closer is a hypernym of slammer; that is, closer is a word with a broader meaning than slammer:

slammer (noun)	closer (noun)
a correctional institution used to detain persons who are in the lawful custody of the government (either accused persons awaiting trial or convicted persons serving a sentence)	(baseball) a relief pitcher who can protect a lead in the last inning or two of the game
a person who closes things violently	a person who closes something

slammer (adverb)	closer (adverb)
	(comparative of `near' or `close') within a shorter distance