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: Water is essential for all life on Earth. 
Sentence2: H2O is needed for all life on Eartth.

Answer: Earth


Question: Sentence1: a warm front causes cloudy and rainy weather. 
Sentence2: Stratus clouds are associated with a warm front.

Answer: front


Question: Sentence1: Endospores are commonly found in soil and water. 
Sentence2: bacterium are commonly found in soil and water.

Answer:
commonly