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.
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Question: Sentence1: Infection is what ultimately leads to death. 
Sentence2: scraping oneself on a contaminated object may cause death.

Answer: death


Question: Sentence1: a sifter is used for separating mixtures. 
Sentence2: a sifter is used for some recipes.

Answer: sifter


Question: Sentence1: animals require water for survival. 
Sentence2: In order to survive, animals require hydration of their cells.

Answer:
animals