Yes, Kim and Stephen are proper nouns, the names of specific people.
Stephen Jin-Woo Kim was born in 1967.
Stephen Kim Sou-hwan died in 2009.
Stephen Kim Sou-hwan was born in 1922.
In the question above, nouns and sentence are the only nouns. Neither of which are proper nouns.
Plural nouns are not capitalized, unless they are proper nouns.
proper nouns = Helen, Romecommon nouns = table, computer
There are no proper nouns in the sentence.
The common noun is person; the proper nouns are Spaniard and Spain.
The common nouns are: capital and state.The proper nouns are: Texas and Austin.
Proper nouns are the unique names of people, places, or things. Common nouns are the words for general things. Pronouns always replace proper and common nouns.
None of them are proper nouns. They are all common nouns that refer to colors.
Proper nouns are always capitalised, but adjectives are not.