allocation vs apportionment

allocation and apportionment both are nouns.

Word	Noun	Adjective	Verb	Adverb
allocation	Yes	No	No	No
apportionment	Yes	No	No	No

As nouns, allocation and apportionment are synonyms defined as:

allocation and apportionment: the act of distributing by allotting or apportioning; distribution according to a plan

Other synonyms of allocation include allotment, apportioning, assignation, parceling, parcelling.

allocation (noun)	apportionment (noun)
the act of distributing by allotting or apportioning; distribution according to a plan	the act of distributing by allotting or apportioning; distribution according to a plan
(computer science) the assignment of particular areas of a magnetic disk to particular data or instructions
a share set aside for a specific purpose