fishing rod vs rod

fishing rod and rod both are nouns.

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

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

fishing rod: a rod of wood or steel or fiberglass that is used in fishing to extend the fishing line
rod: a long thin implement made of metal or wood

fishing rod (noun)	rod (noun)
a rod of wood or steel or fiberglass that is used in fishing to extend the fishing line	any rod-shaped bacterium
	a long thin implement made of metal or wood
	a gangster's pistol
	a visual receptor cell that is sensitive to dim light
	a linear measure of 16.5 feet
	a square rod of land