A homonym is when a word that is pronounced, or said the same way, can mean multiple things.  Some times these words are spelled the same, and sometimes they are not.
Ambiguity Is a word, phrase or sentence that can have more than one meaning.
A noun is a person, place or thing.
> Common Noun
>  Proper Noun
A proper name is a specific name of a person, place, or thing.  The first letters of these words are capitilised.