copy vs multiply

copy is a noun but multiply is not a noun.

Word	Noun	Adjective	Verb	Adverb
copy	Yes	No	Yes	No
multiply	No	No	Yes	Yes

As verbs, multiply is a hyponym of copy; that is, multiply is a word with a more specific, narrower meaning than copy:

Other hyponyms of copy include manifold, imitate, trace, back up, hectograph, clone, mimeo, mimeograph, roneo.

copy (noun)	multiply (noun)
a thing made to be similar or identical to another thing
a reproduction of a written record (e.g. of a legal or school record)
matter to be printed; exclusive of graphical materials
material suitable for a journalistic account

copy (verb)	multiply (verb)
reproduce someone's behavior or looks	have young (animals) or reproduce (organisms)
make a replica of	have offspring or produce more individuals of a given animal or plant
reproduce or make an exact copy of	combine or increase by multiplication
copy down as is	make multiple copies of
	combine by multiplication

copy (adverb)	multiply (adverb)
	in several ways; in a multiple manner