Photostat machine vs duplicator

Photostat machine and duplicator both are nouns.

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

As nouns, duplicator is a hypernym of Photostat machine; that is, duplicator 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
duplicator: apparatus that makes copies of typed, written or drawn material

Other hypernyms of Photostat machine include copier.

Photostat machine (noun)	duplicator (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