incompatible vs contradictory

incompatible is not a noun while contradictory is a noun.

Word	Noun	Adjective	Verb	Adverb
incompatible	No	Yes	No	No
contradictory	Yes	Yes	No	No

incompatible (noun)	contradictory (noun)
	two propositions are contradictories if both cannot be true (or both cannot be false) at the same time

incompatible (adjective)	contradictory (adjective)
used especially of drugs or muscles that counteract or neutralize each other's effect	of words or propositions so related that both cannot be true and both cannot be false
not compatible	unable for both to exist or be true at the same time
incapable of being used with or connected to other devices or components without modification	in disagreement
not suitable to your tastes or needs	that confounds or contradicts or confuses
of words so related that one contrasts with the other
used especially of solids or solutions; incapable of blending into a stable homogeneous mixture
not in keeping with what is correct or proper
not compatible with other facts
not easy to combine harmoniously