plump down vs put down

plump down and put down both are verbs.

Word	Noun	Adjective	Verb	Adverb
plump down	No	No	Yes	No
put down	No	No	Yes	No

As verbs, put down is a hypernym of plump down; that is, put down is a word with a broader meaning than plump down:

Other hypernyms of plump down include place down, set down.

plump down (verb)	put down (verb)
set (something or oneself) down with or as if with a noise	put down in writing; of texts, musical compositions, etc.
drop heavily	make a record of; set down in permanent form
	put in a horizontal position
	remove (cargo, people, etc.) from and leave
	cause to sit or seat or be in a settled position or place
	put (an animal) to death
	reduce in worth or character, usually verbally
	cause to come to the ground