1: Made or become different in nature or form.
2: A contest with rules played for amusement .
3: A treeless grassy plain.
4: The highest or uppermost side of anything.
5: Making impure; 'Those factories there are ______ the ocean, killing the fish.'
6: Oval-shaped hill that has been “plastered” by a glacier.
13: Used to have controlled fires inside a house.
15: Very useful for tickling people.
16: Gases ejected from an engine as waste products.
20: A small hard particle; a ______ of sand.