apportioning vs apportionment

apportioning and apportionment both are nouns.

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

As nouns, apportioning and apportionment are synonyms defined as:

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

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

apportioning (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