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.

[EX Q]: Sentence1: dew is formed when water vapor condenses over night. 
Sentence2: dew is formed when cooling  over night.
[EX A]: dew

[EX Q]: Sentence1: Lions live in social groups called prides. 
Sentence2: Chimpanzees live in social groups called communities.
[EX A]: groups

[EX Q]: Sentence1: Flagellates are the smallest of the protozoa and use a few whip like flagella to move. 
Sentence2: Flagellates can be classified on the basis of how they use a few whip to move.
[EX A]:
Flagellates