back saw vs handsaw

back saw and handsaw both are nouns.

Word	Noun	Adjective	Verb	Adverb
back saw	Yes	No	No	No
handsaw	Yes	No	No	No

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

back saw: a handsaw that is stiffened by metal reinforcement along the upper edge
handsaw: a saw used with one hand for cutting wood

Other hypernyms of back saw include carpenter's saw, hand saw.

back saw (noun)	handsaw (noun)
a handsaw that is stiffened by metal reinforcement along the upper edge	a saw used with one hand for cutting wood