dovetail saw vs back saw

dovetail saw and back saw both are nouns.

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

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

dovetail saw: a small backsaw used to cut dovetails.
back saw: a handsaw that is stiffened by metal reinforcement along the upper edge

Other hypernyms of dovetail saw include backsaw.

dovetail saw (noun)	back saw (noun)
a small backsaw used to cut dovetails.	a handsaw that is stiffened by metal reinforcement along the upper edge