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'.
No, mom is a common noun, a general word for any female  parent.    A proper noun is the name of a specific person, place, thing, or a  title.   When the noun 'mo â¦ m' is used as a title when speaking to or writing  to a specific person, the noun 'Mom' is a proper noun. Answered.