Grasshopper is a common noun.
Common
"Park Avenue" is a proper noun, because it is a place. Proper nouns like this should always be capitalized.
Common
It is a proper noun, because it is the name of a specific thing.
proper
Proper noun
The word grasshopper is a common noun as a word for an insect or an alcoholic drink.The word grasshopper is a proper noun as the name of a specific person, place, thing, or a title. Examples:Grasshopper Island, Okaloacoochee Slough State Forest, FLGrasshopper Cafe, Charlestown, MA or Grasshopper Cafe, Calmar, AB CanadaThe Grasshopper (phone systems), Needham, MA"The Grasshopper" by Anton Chekhov
"Grasshopper" is typically considered a common noun, as it refers to a general type of insect. However, if you were to use it as a specific name for a particular grasshopper character or brand, then it could function as a proper noun.
"Park Avenue" is a proper noun, because it is a place. Proper nouns like this should always be capitalized.
Common
It is a proper noun, because it is the name of a specific thing.
proper
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?