The noun Doug is a proper noun, the name of a person. The noun diner is a common noun, a word for any diner anywhere.If there is a restaurant (real of fictional) named Doug's Diner, that is a proper noun, the name of a specific place. Proper nouns are always capitalized.
The noun 'diner' is a word for a type of restaurant or a person who is eating.Example sentence: A person eating at a diner is also called a diner.
The noun form for the verb to dine is diner, one who dines or a place to dine.
The singular possessive form of the noun diner is diner's.Examples:The diner's specials are posted on that board.The diner's tie dipped into his soup.
Common
Common noun
common
Pea is a common noun, and peas is the plural...still a common noun.
A common noun.
Most definitely a common noun.
Camel is a common noun.
Th word tail is a common noun because the first letter of a proper noun is capitalized.