you would be two words in one. You could take a house and a boat and make a HOUSEBOAT. You could take a boat you row and make it a ROWBOAT. What else could you do if you were a compound word?
you would add things together. you could add poeple and animals. You could add up and down or side to side.
You would start every sentence. You would start everyone's name, city, and state. What else could you start if you were a capital letter?