Photostat vs duplicator

Photostat and duplicator both are nouns.

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

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

Photostat: 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 include copier.

Photostat (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