fax vs facsimile

fax and facsimile both are nouns.

Word	Noun	Adjective	Verb	Adverb
fax	Yes	No	Yes	No
facsimile	Yes	No	Yes	No

As nouns, fax and facsimile are synonyms defined as:

Other synonyms of fax include facsimile machine.

As verbs, fax and facsimile are synonyms defined as:

Other synonyms of fax include telefax.

fax (noun)	facsimile (noun)
duplicator that transmits the copy by wire or radio	duplicator that transmits the copy by wire or radio
	an exact copy or reproduction

fax (verb)	facsimile (verb)
send something via a facsimile machine	send something via a facsimile machine