The noun form of the adjective 'superstitious' is superstitiousness.
A related noun form is superstition.
"Because I am not superstitious, it does not bother me that a black cat just crossed my path."
The word superstition is normally a noun. For instance, in the sentence "Molly has a superstition about black cats," the word is a noun. You could also say "Molly has a superstitious fear of black cats," where "superstitious" is an adjective describing the word fear. The only case I can think of where superstition would be an adjective would be something where you were talking about the Superstition Mountains in Arizona.
The noun form for the adjective horrible is horribleness.
The noun form of the adjective 'prosperous' is prosperousness.A related noun form is prosperity.
The noun form of the adjective obedient is obedience.
noun form of religious
The noun form is punisher
Implication is the noun form of "imply."
The noun form for the adjective austere is austereness. Another noun form is austerity.
The noun form for the adjective glaring is glaringness. Another noun form is glare.
The noun form for the adjective acrimonious is acrimoniousness.A related noun form is acrimony.
noun = mud The noun form for the adjective muddy is muddiness.