circular saw vs saw

circular saw and saw both are nouns.

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

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

circular saw: a power saw that has a steel disk with cutting teeth on the periphery; rotates on a spindle
saw: a power tool for cutting wood

Other hypernyms of circular saw include power saw, sawing machine.

circular saw (noun)	saw (noun)
a power saw that has a steel disk with cutting teeth on the periphery; rotates on a spindle	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

circular saw (verb)	saw (verb)
	cut with a saw