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 not generally counted as English terms except when accepted into the language as an eponym â such as GeigerâMÃ¼ller tube, or the English terms roentgen after Wilhelm RÃ¶ntgen, and biro after LÃ¡szlÃ³ BÃ­rÃ³, in which case any diacritical mark is often lost.