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: Heat and temperature are the same. 
Sentence2: a thermometer is used to measure heat.

Answer: Heat


Question: Sentence1: if fossils of a water animal or plant are found in a place then that place used to be covered by water in the past. 
Sentence2: Common fossils include plant fossils like ferns.

Answer: plant


Question: Sentence1: Sepals are usually green, which camouflages the bud from possible consumers. 
Sentence2: Another way plants protect themselves is through camouflage.

Answer:
camouflages