Two classes of nouns are common nouns and proper nouns:
Other classes of nouns are:
singular and plural nouns
abstract and concrete nouns
possessive nouns
collective nouns
compound nouns
count and non-count (mass) nouns
gerunds (verbal nouns)
attributive nouns
proper nouns common nouns pro nouns nouns
The major classes of nouns are common nouns (e.g. dog, city), proper nouns (e.g. Paris, McDonald's), abstract nouns (e.g. love, happiness), concrete nouns (e.g. table, tree), countable nouns (e.g. book, cat), and uncountable nouns (e.g. water, air).
nouns
Two types of nouns are common and proper nouns.
A proper noun is the name of a person, place, thing, or a title. Some proper nouns for five classes of nouns are:singular and plural nouns: Elvis Presley and the Everly Brothersconcrete and abstract nouns: The Grand Canyon and the Land of Ozcompound nouns: Golden Gate Bridgepossessive nouns; "Schindler's List", 1993 moviecollective nouns: International Brotherhood of Teamsters
The two nouns in your sentence are words and nouns, they are plural, common nouns.
Two kinds of nouns are common or proper, singular or plural.
Abstract nouns:educationtroubleConcrete nouns: elevatortree
The two nouns, 'nouns' and 'sentence' are placed correctly in your sentence.
The two numbers of nouns are singular and plural.
I think this is right nouns, verbs, and modifiers
yes