Master

1. Someone who has control over something or someone. She works as a school master.
2. Highly skilled. He is a master carpenter.
3. Owner of a animal or slave. A good master should take care of their pets.
4. The captain of a merchant ship. The master ordered all hands on deck.
5. A university degree. He received a Master's degree in Engineering.
6. The original of a document or recording. We made copies of the master.
7. An expert at something. Mark Twain was a master of fiction.
8. To learn to a high degree of proficiency. It took her years to master the art of needlecraft.
9. Something suitable for the master of the house. The master bath lies next the our bedroom.