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: Average vehicle speed rises by only 0.3 miles per hour. 
Sentence2: a speedometer measures miles per hour.

SOLUTION: hour

PROBLEM: Sentence1: With a spatula, fold in flour mixture. 
Sentence2: a sifter is used for separating flour.

SOLUTION: flour

PROBLEM: Sentence1: a wildfire changes an ecosystem drastically. 
Sentence2: uncontrollable burning changes an ecosystem drastically.

SOLUTION:
changes