assign vs assignation

assign is not a noun while assignation is a noun.

Word	Noun	Adjective	Verb	Adverb
assign	No	No	Yes	No
assignation	Yes	No	No	No

assign (noun)	assignation (noun)
	a secret rendezvous (especially between lovers)
	the act of distributing by allotting or apportioning; distribution according to a plan

assign (verb)	assignation (verb)
select something or someone for a specific purpose
attribute or credit to
decide as to where something belongs in a scheme
attribute or give
transfer one's right to
give out
make undue claims to having
give an assignment to (a person) to a post, or assign a task to (a person)