The noun 'tomatoes' is a common noun, the plural form of the noun 'tomato'; a general word for a type of fruit (often prepared as a vegetable) that has many varieties; a word for any tomatoes of any kind.
A proper noun is the name or title of a specific person, place, or thing; for example, Hot Tomatoes Neapolitan Pizza(shop) in Pittsfield MA or "Attack of the Killer Tomatoes" (1978 movie).
"Park Avenue" is a proper noun, because it is a place. Proper nouns like this should always be capitalized.
In general, vegetable names are not capitalized unless they are part of a proper name or at the beginning of a sentence.
Common
It is a proper noun, because it is the name of a specific thing.
proper
No, the noun 'feta' is a common noun, a general word for a type of cheese of Greek origin.A proper noun is the name of a specific person, place, or thing. A proper noun for the common noun 'feta' is the name of a specific feta, for example, Athenos Feta or Nikos Tomato Basil Feta.
Proper noun
Pencil proper or common noun
it's a common noun. a proper noun would be Spider-Man.
Proper noun or common noun
The noun cassette is a common noun.
a common noun?