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: First, the bottle is calibrated with a graduated cylinder. 
Sentence2: calibration is performed with a cylinder.

Answer: calibrated


Question: Sentence1: Algae have varied life cycles. 
Sentence2: And fish eat algae.

Answer: Algae


Question: Sentence1: astronauts require preserved food for extended flights. 
Sentence2: food is irradiated for space travel.

Answer:
food