No, the noun form for the adjective proper is properness.
The word properly is an adverb, a word to modify a verb.
A proper noun is a specific name, not a name of a category of things. Herbert Hoover is a proper noun. Reptiles is a plural noun. It is properly called a noun, but is not classed as a "proper noun".
The noun form of the adjective 'proper' is properness.
The word forgetful is an adjective.The noun form of the adjective forgetful is forgetfulness, a common noun. There is no proper noun form.
The possessive form for the proper noun Bliss is Bliss's.
The word 'Arabian' is the proper adjective form of the proper noun Arabia.
The plural of the proper noun is Carolinas.
The word 'Buddhistic' is the adjective form of the noun Buddhism.The adjective 'Buddhistic' is a proper adjective; the noun 'Buddhism' is a proer noun. A proper adjective and a proper noun are always capitalized.
Martin, is a name of a person, a proper noun. The plural form for two or more people named Martin is Martins.
Turner is a proper noun (a name). Turner's is the possessive form.
The plural form of the name Castillo is Castillos.A proper noun is always capitalized.
The word 'Annalise' is a noun, a proper noun, the name of a person. A proper noun is always capitalized.
The possessive form for the proper noun Jamaica is Jamaica's.