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: when a body of water receives more water than it can hold , a flood occurs. 
Sentence2: Floods are deadly, floods are devastating.

Answer: flood


Question: Sentence1: Flies are insects with two wings. 
Sentence2: Flies are arthropods with two wings.

Answer: Flies


Question: Sentence1: living things all require energy for survival. 
Sentence2: All foods provide energy.

Answer:
energy