What't the d____ between a boat and a ship?

What't the d____ between a boat and a ship? There is a great d____ between summer and winter. 一道英语奥数题：The distance between A and B is 10km .A ship sails f What is the difference between a hill and a pill? What is the difference between a monkey and a flea? what is the different between a tramp and a liner? what's the relationship between a husband and a wife? what's the diference between a pill and a hill What's the difference between a pill and a hill what are the difference between a map and a plan What is the difference between a and the boat and ship