"Park Avenue" is a proper noun, because it is a place. Proper nouns like this should always be capitalized.
proper
Yes, the noun 'ivory' is a common noun, a general for for a substance that makes up the tusks of elephants, walruses, and other animals; a general word for a pale whitish yellow color.The word 'ivory' also functions as an adjective.
ivory (:
common
common and proper
Although not a common species, the ivory gull is listed as "Near Threatened", not endangered, by the IUCN.
no because its not common in the world today.
common
It is a proper noun, because it is the name of a specific thing.
it's a common noun. a proper noun would be Spider-Man.
No. Ivory sales in Cote d'Ivoire are strictly prohibited and tightly watched. Elephant populations of western Africa were decimated by the trade in ivory. Beginning in the 19th century, the area was one of the chief export areas for the ivory trade to Europe and became known as the ivory coast (common noun). The country was named by the French who colonized this area.