quotation vs excerpt

quotation and excerpt both are nouns.

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

As nouns, excerpt is a hypernym of quotation; that is, excerpt is a word with a broader meaning than quotation:

Other hypernyms of quotation include excerption, extract, selection.

quotation (noun)	excerpt (noun)
the practice of quoting from books or plays etc.	a passage selected from a larger work
a passage or expression that is quoted or cited
a short note recognizing a source of information or of a quoted passage
a statement of the current market price of a security or commodity

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