buzz saw vs power saw

buzz saw and power saw both are nouns.

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

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

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

Other hypernyms of buzz saw include saw, sawing machine.

buzz saw (noun)	power saw (noun)
a power saw that has a steel disk with cutting teeth on the periphery; rotates on a spindle	a power tool for cutting wood