Is poor people proper noun

No, the noun people is a common noun, the plural form of the noun person; a Word for any people, anywhere. The Word poor is an adjective describing the noun people. Used together as a compound noun, 'poor people' is a common noun, a Word for any 'poor people' anywhere.

A proper noun is the name of a person, a place, a thing, or a title; for example:

• Edgar Allan Poe, poet and poor person
• Poor People's Pub, Sanbornville, NH
• Alan Price song 'Poor People'
• 'Poor People on Shore' by Pablo Picasso