fly rod vs fishing rod

fly rod and fishing rod both are nouns.

Word	Noun	Adjective	Verb	Adverb
fly rod	Yes	No	No	No
fishing rod	Yes	No	No	No

As nouns, fishing rod is a hypernym of fly rod; that is, fishing rod is a word with a broader meaning than fly rod:

fly rod: a long flexible fishing rod used in fly fishing
fishing rod: a rod of wood or steel or fiberglass that is used in fishing to extend the fishing line

Other hypernyms of fly rod include fishing pole.

fly rod (noun)	fishing rod (noun)
a long flexible fishing rod used in fly fishing	a rod of wood or steel or fiberglass that is used in fishing to extend the fishing line