Is good a proper noun

Answer 1

No, the noun good is an common noun; a word for someone of virtue or kindness; something that is good; something conforming to a moral order; a word any good of any kind.

The plural form , goods, is also a common noun; a word for manufactured articles or products; a word for any goods of any kind.

A proper noun is the name of a specific person, place, thing, or a title; for example: Colonel Michael T. Good, NASA Astronaut

Good Harbor Bay (Lake Michigan), MI

Good 'N Plenty Restaurant, Smoketown, PA

Good & Plenty candies

"The Good, the Bad and the Ugly", 1966 movie with Clint Eastwood and Eli Wallach

The noun form for the adjective good is the common noun, goodness.