sap vs expend

sap is a noun but expend is not a noun.

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

As verbs, expend is a hypernym of sap; that is, expend is a word with a broader meaning than sap:

Other hypernyms of sap include consume, deplete, eat, eat up, exhaust, run through, use, use up, wipe out.

sap (noun)	expend (noun)
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

sap (verb)	expend (verb)
excavate the earth beneath	use up (resources or materials)
deplete	pay out