fishing rig vs appurtenance

fishing rig and appurtenance both are nouns.

Word	Noun	Adjective	Verb	Adverb
fishing rig	Yes	No	No	No
appurtenance	Yes	No	No	No

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

fishing rig: gear used in fishing
appurtenance: equipment consisting of miscellaneous articles needed for a particular operation or sport etc.

Other hypernyms of fishing rig include gear, paraphernalia.

fishing rig (noun)	appurtenance (noun)
gear used in fishing	a supplementary component that improves capability
	equipment consisting of miscellaneous articles needed for a particular operation or sport etc.