severalise vs sex

severalise is not a noun while sex is a noun.

Word	Noun	Adjective	Verb	Adverb
severalise	No	No	Yes	No
sex	Yes	No	Yes	No

As verbs, sex is a hyponym of severalise; that is, sex is a word with a more specific, narrower meaning than severalise:

severalise (noun)	sex (noun)
	activities associated with sexual intercourse
	the properties that distinguish organisms on the basis of their reproductive roles
	all of the feelings resulting from the urge to gratify sexual impulses
	either of the two categories (male or female) into which most organisms are divided

severalise (verb)	sex (verb)
mark as different	tell the sex (of young chickens)
distinguish or separate	to evoke sexual feelings