rowing boat vs dory

rowing boat and dory both are nouns.

Word	Noun	Adjective	Verb	Adverb
rowing boat	Yes	No	No	No
dory	Yes	No	No	No

As nouns, dory is a hypernym of rowing boat; that is, dory is a word with a broader meaning than rowing boat:

rowing boat: a rowboat
dory: a small boat of shallow draft with cross thwarts for seats and rowlocks for oars with which it is propelled

Other hypernyms of rowing boat include dinghy, rowboat.

rowing boat (noun)	dory (noun)
a rowboat	marine fishes widely distributed in mid-waters and deep slope waters
	pike-like freshwater perches
	a small boat of shallow draft with cross thwarts for seats and rowlocks for oars with which it is propelled