Can you spell?

Bravo to me! I've mastered how to spell my first 3 words (other than my own name).  They are RAT,  HAT and CAT.  Notice anything similiar?  Yes, they all end with "at".  

Now, Mummy is trying to teach me to spell DAD and SAD.  Words which end with "ad".  Let's see when I will master these 2 words.