division vs divisional

division is a noun but divisional is not a noun.

Word	Noun	Adjective	Verb	Adverb
division	Yes	No	No	No
divisional	No	Yes	No	No

division (noun)	divisional (noun)
the act or process of dividing
an arithmetic operation that is the inverse of multiplication; the quotient of two numbers is computed
the act of dividing or partitioning; separation by the creation of a boundary that divides or keeps apart
one of the portions into which something is regarded as divided and which together constitute a whole
discord that splits a group
an army unit large enough to sustain combat
a group of ships of similar type
a unit of the United States Air Force usually comprising two or more wings
an administrative unit in government or business
(botany) taxonomic unit of plants corresponding to a phylum
(biology) a group of organisms forming a subdivision of a larger category
a league ranked by quality

division (adjective)	divisional (adjective)
	of or relating to a military division
	serving to divide or marking a division
	constituting a division or an aliquot part of the basic monetary unit