Simplify the following text for a Grade 5 native English-speaking person.
Original: The term covers a variety of boats , larger than small vessels such as sailboards and smaller than sailing ships , but distinctions in the size are not strictly defined and what constitutes a sailing ship , sailboat , or a smaller vessel ( such as a sailboard ) varies by region and culture .
Simplified: The word covers many kinds of boats , from small sailboards to large sailing ships .