gangsaw vs power saw

gangsaw and power saw both are nouns.

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

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

gangsaw: a power saw that has several parallel blades making simultaneous cuts
power saw: a power tool for cutting wood

Other hypernyms of gangsaw include saw, sawing machine.

gangsaw (noun)	power saw (noun)
a power saw that has several parallel blades making simultaneous cuts	a power tool for cutting wood