quotation vs agraphon

quotation and agraphon both are nouns.

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

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

quotation: a passage or expression that is quoted or cited
agraphon: (usually plural) a saying of Jesus not in the canonical gospels but found in other New Testament or early Christian writings.

Other hyponyms of quotation include epigraph, mimesis, misquotation, misquote.

quotation (noun)	agraphon (noun)
the practice of quoting from books or plays etc.	(usually plural) a saying of Jesus not in the canonical gospels but found in other New Testament or early Christian writings.
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