Photostat machine vs copier

Photostat machine and copier both are nouns.

Word	Noun	Adjective	Verb	Adverb
Photostat machine	Yes	No	No	No
copier	Yes	No	No	No

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

Photostat machine: a duplicating machine that makes quick positive or negative copies directly on the surface of prepared paper
copier: apparatus that makes copies of typed, written or drawn material

Other hypernyms of Photostat machine include duplicator.

Photostat machine (noun)	copier (noun)
a duplicating machine that makes quick positive or negative copies directly on the surface of prepared paper	apparatus that makes copies of typed, written or drawn material