A noun is a person, place, or thing, but a proper noun is a specific person place or thing. Names are an easy distinction to make, but there are some items that seem more difficult. There is a website for grammar that addresses this very nicely. For more information on capitalization see http://grammar.quickanddirtytips.com/Capitalizing-Proper-Nouns.aspx . This website is wonderful for any
. grammar need you may have.