settle vs go under

settle is a noun but go under is not a noun.

Word	Noun	Adjective	Verb	Adverb
settle	Yes	No	Yes	No
go under	No	No	Yes	No

As verbs, go under is a hypernym of settle; that is, go under is a word with a broader meaning than settle:

Other hypernyms of settle include go down, settle, sink.

As verbs, settle and go under are synonyms defined as:

Other synonyms of settle include go down, sink.

settle (noun)	go under (noun)
a long wooden bench with a back

settle (verb)	go under (verb)
take up residence and become established	be called; go by a certain name
form a community	go under
become settled or established and stable in one's residence or life style	disappear beyond the horizon
establish or develop as a residence
make final; put the last touches on; put into final form
become resolved, fixed, established, or quiet
come as if by falling
bring to an end; settle conclusively
settle conclusively; come to terms
end a legal dispute by arriving at a settlement
come to terms
accept despite lack of complete satisfaction
get one's revenge for a wrong or an injury
fix firmly
arrange or fix in the desired order
come to rest
settle into a position, usually on a surface or ground
cause to become clear by forming a sediment (of liquids)
sink down or precipitate
go under
become clear by the sinking of particles
dispose of; make a financial settlement