go down vs set

go down is not a noun while set is a noun.

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

As verbs, go down and set are synonyms defined as:

Other synonyms of go down include go under.

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

go down (noun)	set (noun)
	several exercises intended to be done in series
	the act of putting something in position
	representation consisting of the scenery and other properties used to identify the location of a dramatic production
	any electronic equipment that receives or transmits radio or tv signals
	(psychology) being temporarily ready to respond in a particular way
	a relatively permanent inclination to react in a particular way
	the descent of a heavenly body below the horizon
	a group of things of the same kind that belong together and are so used
	an unofficial association of people or groups
	(mathematics) an abstract collection of numbers or symbols
	the process of becoming hard or solid by cooling or drying or crystallization
	a unit of play in tennis or squash

go down (adjective)	set (adjective)
	set down according to a plan
	being below the horizon
	converted to solid form (as concrete)
	fixed and unmoving
	(usually followed by `to' or `for') on the point of or strongly disposed
	situated in a particular spot or position
	determined or decided upon as by an authority

go down (verb)	set (verb)
grow smaller	arrange attractively
stop operating	produce fruit
be defeated	alter or regulate so as to achieve accuracy or conform to a standard
be ingested	put into a certain state; cause to be in a certain state
go under	set to a certain position or cause to operate correctly
disappear beyond the horizon	equip with sails or masts
move downward and lower, but not necessarily all the way	become gelatinous
be recorded or remembered	make ready or suitable or equip in advance for a particular purpose or for some use, event, etc
	get ready for a particular purpose or event
	fix conclusively or authoritatively
	estimate
	decide upon or fix definitely
	establish as the highest level or best performance
	urge to attack someone
	put into a certain place or abstract location
	fix in a border
	give a fine, sharp edge to a knife or razor
	insert (a nail or screw below the surface, as into a countersink)
	put or set (seeds, seedlings, or plants) into the ground
	put into a position that will restore a normal state
	adapt for performance in a different way
	locate
	set in type
	apply or start
	disappear beyond the horizon