reallocation vs assignation

reallocation and assignation both are nouns.

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

As nouns, assignation is a hypernym of reallocation; that is, assignation is a word with a broader meaning than reallocation:

reallocation: a new apportionment (especially a new apportionment of congressional seats in the United States on the basis of census results)
assignation: the act of distributing by allotting or apportioning; distribution according to a plan

Other hypernyms of reallocation include allocation, allotment, apportioning, apportionment, parceling, parcelling.

reallocation (noun)	assignation (noun)
a new apportionment (especially a new apportionment of congressional seats in the United States on the basis of census results)	a secret rendezvous (especially between lovers)
a share that has been allocated again	the act of distributing by allotting or apportioning; distribution according to a plan