^{THE   SPELLING  OF  MUCUS  GIVEN  IS  WRONG  IT  SHOULD  BE  MUCUS  NOT  MUCOUS............   PLEASE  LOOK  INTO  THIS  MATTER  AS  SOON  AS  POSSIBLE.  THANKS.............}

Actually, mucus is a noun and mucous is adjective. For example, The secretion that comes out of your nose when you sneeze is 'mucus' and the lining of the nasal cavity that secretes mucus is 'mucous' membrane. So, both the terms are different and can be used depending on the condition.