TASK DEFINITION: Generate an overlapping word between the given two sentences. When you find the overlapping words, they don't have to match exactly, e.g., "survival" and "survive" are valid overlapping words. Little words like "the" or "of" don't count! You must generate significant words which are not the stop words.
PROBLEM: Sentence1: Ice is frozen water. 
Sentence2: ice expands.

SOLUTION: Ice

PROBLEM: Sentence1: Oil and gasoline are fossil fuels. 
Sentence2: lawn mowers convert fossil fuels into motion.

SOLUTION: fossil

PROBLEM: Sentence1: when a body of water receives more water than it can hold , a flood occurs. 
Sentence2: Lakes are large bodies of inland water.

SOLUTION:
body