stoop vs change posture

stoop is a noun but change posture is not a noun.

Word	Noun	Adjective	Verb	Adverb
stoop	Yes	No	Yes	No
change posture	No	No	Yes	No

stoop (noun)	change posture (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

stoop (verb)	change posture (verb)
carry oneself, often habitually, with head, shoulders, and upper back bent forward	undergo a change in bodily posture
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