buzz saw vs circular saw

buzz saw and circular saw both are nouns.

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

As nouns, buzz saw and circular saw are synonyms defined as:

buzz saw and circular saw: a power saw that has a steel disk with cutting teeth on the periphery; rotates on a spindle

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