The word 'was' is not a noun. The word 'was' is a verb; the first and third person, singular form of the verb 'to be'.
Examples:
I was a teacher in Mexico last year. (verb)
He was standing by the fountain. (auxiliary verb)
Mom said that she was busy. (verb)
It was raining all afternoon. (auxiliary verb)
A noun is a word for a person, a place, or a thing.
The nouns in the example sentences are:
common noun
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.
it is re@lly @ common noun
common
"Park Avenue" is a proper noun, because it is a place. Proper nouns like this should always be capitalized.