fax vs copier

fax and copier both are nouns.

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

As nouns, copier is a hypernym of fax; that is, copier is a word with a broader meaning than fax:

Other hypernyms of fax include duplicator.

fax (noun)	copier (noun)
duplicator that transmits the copy by wire or radio	apparatus that makes copies of typed, written or drawn material

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