excerpt vs citation

excerpt and citation both are nouns.

Word	Noun	Adjective	Verb	Adverb
excerpt	Yes	No	Yes	No
citation	Yes	No	No	No

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

excerpt (noun)	citation (noun)
a passage selected from a larger work	an official award (as for bravery or service) usually given as formal public statement
	a short note recognizing a source of information or of a quoted passage
	a summons that commands the appearance of a party at a proceeding
	a passage or expression that is quoted or cited
	(law) the act of citing (as of spoken words or written passages or legal precedents etc.)

excerpt (verb)	citation (verb)
take out of a literary work in order to cite or copy