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: Microbes are also called bacteria or microorganisms. 
Sentence2: Disease-causing bacteria have a negative impact on the body.

Answer: bacteria


Question: Sentence1: the uterus is used in reproduction. 
Sentence2: Reproduction uses the same organ as menstruation.

Answer: reproduction


Question: Sentence1: Electrical energy can be converted into kinetic energy and heat energy by an electric motor. 
Sentence2: a battery can convert chemical energy into kinetic energy.

Answer:
energy