cower vs stoop

cower is not a noun while stoop is a noun.

Word	Noun	Adjective	Verb	Adverb
cower	No	No	Yes	No
stoop	Yes	No	Yes	No

As verbs, stoop is a hypernym of cower; that is, stoop is a word with a broader meaning than cower:

Other hypernyms of cower include bend, bow, crouch.

cower (noun)	stoop (noun)
	an inclination of the top half of the body forward and downward
	small porch or set of steps at the front entrance of a house
	basin for holy water

cower (verb)	stoop (verb)
show submission or fear	carry oneself, often habitually, with head, shoulders, and upper back bent forward
crouch or curl up	bend one's back forward from the waist on down
	descend swiftly, as if on prey
	sag, bend, bend over or down
	debase oneself morally, act in an undignified, unworthy, or dishonorable way