fretsaw vs saw

fretsaw and saw both are nouns.

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

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

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

Other hypernyms of fretsaw include power saw, sawing machine.

fretsaw (noun)	saw (noun)
fine-toothed power saw with a narrow blade; used to cut curved outlines	hand tool having a toothed blade for cutting
	a power tool for cutting wood
	a condensed but memorable saying embodying some important fact of experience that is taken as true by many people

fretsaw (verb)	saw (verb)
	cut with a saw