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: Acids dissolve in base and turn blue litmus red. 
Sentence2: acid changes color.

SOLUTION: Acids

PROBLEM: Sentence1: Mitosis is cell division. 
Sentence2: mitosis often causes growth.

SOLUTION: Mitosis

PROBLEM: Sentence1: Time is measured in minutes. 
Sentence2: A watch is used for measuring minutes.

SOLUTION:
minutes