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: the moon revolving around the Earth causes the phases of the moon. 
Sentence2: Lets start our discussion of the Moon's phases with the New Moon phase.

Answer: phases


Question: Sentence1: Streams may start with runoff or water seeping out of a spring. 
Sentence2: streams may start with runoff or h2o seeping out of a spring.

Answer: Streams


Question: Sentence1: Skin pressure receptors announce that the feet are on the ground or the buttocks are on a chair. 
Sentence2: receptors on the epidermis detect pressure and announce to the feet or buttocks that you touching something.

Answer:
announce