nut key vs climbing equipment

nut key and climbing equipment both are nouns.

Word	Noun	Adjective	Verb	Adverb
nut key	Yes	No	No	No
climbing equipment	Yes	No	No	No

As nouns, climbing equipment is a hypernym of nut key; that is, climbing equipment is a word with a broader meaning than nut key:

nut key: (mountaineering) a tool for extracting a nut, chock, etc, from a crack after use.
climbing equipment: sports equipment used during rock or any other type of climbing.

Other hypernyms of nut key include tool, rock-climbing equipment.

nut key (noun)	climbing equipment (noun)
(mountaineering) a tool for extracting a nut, chock, etc, from a crack after use.	sports equipment used during rock or any other type of climbing.