The plural form of the name Castillo is Castillos.
A proper noun is always capitalized.
VIsitors is obviously not a an adjective. It is a noun in plural form.
The noun 'fungi' is the plural form of the noun 'fungus'.
The plural form for the noun arch is arches.
Assumptions is a noun (plural form of assumption).
The plural form of potential is potentials.
The plural of the proper noun is Carolinas.
The plural form of the proper noun Martin is Martins.
The plural form for the proper noun Finn is Finns.
The plural form for the proper noun Tommy is Tommys.
The plural form of the proper noun (name) 'Domino' is Dominos.Example: The Dominos are my new neighbors.Note: The plural form of the common noun 'domino' is dominoes, a word for the game pieces.
The plural form for the proper noun is Rexroads.
The word Harris is a proper noun, the name of a person. A proper nou is always capitalized.The plural form is Harrises.
The word Kiowas is the plural form for the proper noun Kiowa, a nation of Native American people. Proper nouns are always capitalized.The possessive form for the plural noun Kiowas is Kiowas'.
Eros is a proper noun; proper noun use the same rules for plural as common noun. Words ending in ch, sh, z, x, and s add -es to the end of the word to form the plural. The plural form is Eroses.
The plural of the proper noun Thursday is Thursdays.
Yes, the noun Americans is proper noun, the plural form for American, the name of a specific nationality of people.
The plural form of the proper noun Lopez is Lopezes.example: The Lopezes are my neighbors.