fretsaw vs sawing machine

fretsaw and sawing machine both are nouns.

Word	Noun	Adjective	Verb	Adverb
fretsaw	Yes	No	No	No
sawing machine	Yes	No	No	No

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

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

Other hypernyms of fretsaw include power saw, saw.

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