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).
Guest is a noun. Guests is the plural form of guest. Guests is a plural noun.
The plural of the proper noun is Carolinas.
Martin, is a name of a person, a proper noun. The plural form for two or more people named 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 plural of the proper noun Thursday is Thursdays.
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 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'.
The plural form for the proper noun Tracy is Tracys:There are two Tracys in my class.
Yes, the noun Americans is proper noun, the plural form for American, the name of a specific nationality of people.