buzz saw vs sawing machine

buzz saw and sawing machine both are nouns.

Word	Noun	Adjective	Verb	Adverb
buzz saw	Yes	No	No	No
sawing machine	Yes	No	No	No

As nouns, sawing machine is a hypernym of buzz saw; that is, sawing machine 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
sawing machine: a power tool for cutting wood

Other hypernyms of buzz saw include power saw, saw.

buzz saw (noun)	sawing machine (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