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 nouns are names given to refer to specific common nouns. For instance, car becomes Honda, city becomes Tokyo, teacher becomes Ms. Wong. As we stated before, car, city, and teacher are all common nouns. Itâs Honda, Tokyo, and Ms. Wong that are proper nouns.