cave vs sap

cave and sap both are nouns.

Word	Noun	Adjective	Verb	Adverb
cave	Yes	No	Yes	No
sap	Yes	No	Yes	No

As verbs, sap is a hyponym of cave; that is, sap is a word with a more specific, narrower meaning than cave:

cave (noun)	sap (noun)
a geological formation consisting of an underground enclosure with access from the surface of the ground or from the sea	a piece of metal covered by leather with a flexible handle; used for hitting people
	a person who lacks good judgment
	a watery solution of sugars, salts, and minerals that circulates through the vascular system of a plant

cave (verb)	sap (verb)
explore natural caves	excavate the earth beneath
hollow out as if making a cave or opening	deplete