fretsaw vs power saw

fretsaw and power saw both are nouns.

Word	Noun	Adjective	Verb	Adverb
fretsaw	Yes	No	No	No
power saw	Yes	No	No	No

As nouns, power saw is a hypernym of fretsaw; that is, power saw is a word with a broader meaning than fretsaw:

fretsaw: fine-toothed power saw with a narrow blade; used to cut curved outlines
power saw: a power tool for cutting wood

Other hypernyms of fretsaw include saw, sawing machine.

fretsaw (noun)	power saw (noun)
fine-toothed power saw with a narrow blade; used to cut curved outlines	a power tool for cutting wood