assignation vs tryst

assignation and tryst both are nouns.

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

As nouns, assignation and tryst are synonyms defined as:

assignation (noun)	tryst (noun)
a secret rendezvous (especially between lovers)	a secret rendezvous (especially between lovers)
the act of distributing by allotting or apportioning; distribution according to a plan	a date; usually with a member of the opposite sex