reallocation vs reapportionment

reallocation and reapportionment both are nouns.

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

As nouns, reallocation and reapportionment are synonyms defined as:

reallocation and reapportionment: a new apportionment (especially a new apportionment of congressional seats in the United States on the basis of census results)

Other synonyms of reallocation include reallotment.

reallocation (noun)	reapportionment (noun)
a new apportionment (especially a new apportionment of congressional seats in the United States on the basis of census results)	a new apportionment (especially a new apportionment of congressional seats in the United States on the basis of census results)
a share that has been allocated again