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'.
cat noun [C] (ANIMAL). âº a âsmall, âfurry âanimal with four âlegs and a âtail, often âkept as a âpet, or any of a âgroup of ârelated âanimals that are âwild, and some of which are âlarge and âfierce, such as the âlion.