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: healing requires rest. 
Sentence2: Healing and cell regeneration follows.

SOLUTION: healing

PROBLEM: Sentence1: Lions live in social groups called prides. 
Sentence2: Chimpanzees live in social groups called communities.

SOLUTION: groups

PROBLEM: Sentence1: some flowers become fruits. 
Sentence2: Cucumber fruit are produced only when insects carry pollen to the female flower.

SOLUTION:
fruits