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: Most major Atlantic hurricanes start as small disturbances moving westward off Africa. 
Sentence2: When something that starts as a small disturbance moving westward off Africa then moves over land, it will decrease in strength.

SOLUTION: Africa

PROBLEM: Sentence1: Most water comes from precipitation. 
Sentence2: aquatic animals require precipitation to survive.

SOLUTION: precipitation

PROBLEM: Sentence1: Feathers help birds fly and provide insulation. 
Sentence2: To survive the chill, warm-blooded penguins rely on feathers and fat for insulation.

SOLUTION:
insulation