minimise vs decrease

minimise is not a noun while decrease is a noun.

Word	Noun	Adjective	Verb	Adverb
minimise	No	No	Yes	No
decrease	Yes	No	Yes	No

As verbs, decrease is a hypernym of minimise; that is, decrease is a word with a broader meaning than minimise:

Other hypernyms of minimise include lessen, minify.

minimise (noun)	decrease (noun)
	the act of decreasing or reducing something
	the amount by which something decreases
	a change downward
	a process of becoming smaller or shorter

minimise (verb)	decrease (verb)
make small or insignificant	decrease in size, extent, or range
represent as less significant or important	make become smaller