fretsaw vs jigsaw

fretsaw and jigsaw both are nouns.

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

As nouns, fretsaw and jigsaw are synonyms defined as:

fretsaw and jigsaw: fine-toothed power saw with a narrow blade; used to cut curved outlines

Other synonyms of fretsaw include scroll saw.

fretsaw (noun)	jigsaw (noun)
fine-toothed power saw with a narrow blade; used to cut curved outlines	fine-toothed power saw with a narrow blade; used to cut curved outlines
	a portable power saw with a reciprocating blade; can be used with a variety of blades depending on the application and kind of cut; generally have a plate that rides on the surface that is being cut