collusion vs arrangement

collusion and arrangement both are nouns.

Word	Noun	Adjective	Verb	Adverb
collusion	Yes	No	No	No
arrangement	Yes	No	No	No

As nouns, arrangement is a hypernym of collusion; that is, arrangement is a word with a broader meaning than collusion:

Other hypernyms of collusion include agreement.

collusion (noun)	arrangement (noun)
secret agreement	the act of arranging and adapting a piece of music
agreement on a secret plot	the spatial property of the way in which something is placed
	an organized structure for arranging or classifying
	the thing arranged or agreed to
	a piece of music that has been adapted for performance by a particular set of voices or instruments
	an orderly grouping (of things or persons) considered as a unit; the result of arranging