plump down vs set down

plump down and set down both are verbs.

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

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

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

plump down (verb)	set 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	remove (cargo, people, etc.) from and leave
	put or settle into a position
	cause to sit or seat or be in a settled position or place
	go ashore
	reach or come to rest