reciprocating saw vs power saw

reciprocating saw and power saw both are nouns.

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

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

reciprocating saw: 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
power saw: a power tool for cutting wood

Other hypernyms of reciprocating saw include saw, sawing machine.

reciprocating saw (noun)	power saw (noun)
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	a power tool for cutting wood