split vs separate

split and separate both are nouns.

Word	Noun	Adjective	Verb	Adverb
split	Yes	Yes	Yes	No
separate	Yes	Yes	Yes	No

As verbs, separate is a hypernym of split; that is, separate is a word with a broader meaning than split:

Other hypernyms of split include break, come apart, fall apart, split up.

As verbs, split and separate are synonyms defined as:

Other synonyms of split include part.

As verbs, split and separate are synonyms defined as:

split and separate: discontinue an association or relation; go different ways

Other synonyms of split include break, break up, part, split up.

As verbs, split and separate are synonyms defined as:

Other synonyms of split include carve up, dissever, divide, split up.

split (noun)	separate (noun)
division of a group into opposing factions	a garment that can be purchased separately and worn in combinations with other garments
the act of rending or ripping or splitting something	a separately printed article that originally appeared in a larger publication
extending the legs at right angles to the trunk (one in front and the other in back)
an increase in the number of outstanding shares of a corporation without changing the shareholders' equity
(tenpin bowling) a divided formation of pins left standing after the first bowl
a dessert of sliced fruit and ice cream covered with whipped cream and cherries and nuts
an opening made forcibly as by pulling apart
a lengthwise crack in wood
a promised or claimed share of loot or money
a bottle containing half the usual amount

split (adjective)	separate (adjective)
(especially of wood) cut or ripped longitudinally with the grain	independent; not united or joint
having been divided; having the unity destroyed	standing apart; not attached to or supported by anything
	separated according to race, sex, class, or religion
	have the connection undone; having become separate

split (verb)	separate (verb)
come open suddenly and violently, as if from internal pressure	become separated into pieces or fragments
separate or cut with a tool, such as a sharp instrument	divide into two or more branches so as to form a fork
go one's own way; move apart	arrange or order by classes or categories
discontinue an association or relation; go different ways	mark as different
separate into parts or portions	move or break apart
	force, take, or pull apart
	divide into components or constituents
	go one's own way; move apart
	make a division or separation
	treat differently on the basis of sex or race
	separate into parts or portions
	discontinue an association or relation; go different ways
	act as a barrier between; stand between