Better Letter

Here's a fun word game that's easy to play - my version is called "Better Letter" and I make up all the puzzles myself. It works like this - I give you a list of five words. You must change one and only one letter in each word to make a NEW word. All the new words will be related to each other in a secret category. Give it a try - I'll post the answers in a day or two!

Dig __ __ __

Car __ __ __

Deck __ __ __ __

House __ __ __ __ __

Sheer __ __ __ __ __

Tip: The letter which changes can be any letter, not just the first one.