Noun and Proper noun

Noun noun - A content word that can be used to refer to a person, place, thing, quality, or action.

Proper noun and noun are semantically related in nominal topic. In some cases you can replace phrase "Proper noun" with "Noun", this terms are similar.

Proper noun noun - A noun that denotes a particular thing; usually capitalized.

Noun and proper noun are semantically related in nominal topic. Sometimes you can replace term "Noun" with "Proper noun", this terms are similar.