instruction:
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.
question:
Sentence1: Batteries are a better source of DC electricity. 
Sentence2: a flashlight requires batteries to produce light.
answer:
Batteries


question:
Sentence1: an animal requires nutrients to grow and heal. 
Sentence2: Microbes can help an animal to grow and heal.
answer:
grow


question:
Sentence1: the gravitational pull of the Moon on Earth 's oceans causes the tides. 
Sentence2: the gravitational pull of the Moon on the world's oceans causes the tides.
answer:

Moon