set down vs belly-land

set down and belly-land both are verbs.

Word	Noun	Adjective	Verb	Adverb
set down	No	No	Yes	No
belly-land	No	No	Yes	No

As verbs, belly-land is a hyponym of set down; that is, belly-land is a word with a more specific, narrower meaning than set down:

set down (verb)	belly-land (verb)
put down in writing; of texts, musical compositions, etc.	land on the underside without the landing gear
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