The caffeine content of coffee varies greatly, depending on the beans, how they're roasted, and other factors, but the average for an 8-ounce cup is about 100 milligrams (mg).
No, 'cat' is a common noun, a word for any cat of any kind. A proper noun is the name of a person, a place, a thing, or a title; for example: Cat Deeley, host of TV series 'So You Think You Can Dance'.
Proper Noun Examples. In the following sentences, proper noun examples are compared with common nouns. Notice that the proper nouns are specific and unique, while the common nouns are much more general in nature. Common noun: I want to be a writer. Proper noun: Agatha Christie wrote many books. Common noun: Iâd like to adopt a cat.