reallotment vs allotment

reallotment and allotment both are nouns.

Word	Noun	Adjective	Verb	Adverb
reallotment	Yes	No	No	No
allotment	Yes	No	No	No

As nouns, allotment is a hypernym of reallotment; that is, allotment is a word with a broader meaning than reallotment:

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

Other hypernyms of reallotment include allocation, apportioning, apportionment, assignation, parceling, parcelling.

reallotment (noun)	allotment (noun)
a new apportionment (especially a new apportionment of congressional seats in the United States on the basis of census results)	the act of distributing by allotting or apportioning; distribution according to a plan
	a share set aside for a specific purpose