The possessive form of the noun referee is referee's.Example: The referee's decision was final.
It is a plural noun. It is also a verb in the present tense, third person singular.
At the beginning of a sentence and when it forms part of the proper noun or when it is used as a direct address. Example: Referee George Don't call foul, Referee!
common noun
Common
The referee blew his whistle to signal that there was a penalty.
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.