fishing rod vs fly rod

fishing rod and fly rod both are nouns.

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

As nouns, fly rod is a hyponym of fishing rod; that is, fly rod is a word with a more specific, narrower meaning than fishing rod:

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

Other hyponyms of fishing rod include spinning rod.

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