table name - TypeCreate error

Hi.

Please, I would like to know why I can't create a table with a name 
equal of a type name.

For example, when a try this:CREATE TABLE time (id int);
I get the following error message:ERROR:  TypeCreate: type time already defined

I would expect to be able to create a table with any name different 
than others tables' name.

Thank you in advance,
Felipe.