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: boiling means change from a liquid into a gas by adding heat energy. 
Sentence2: boiling changes a liquid into steam.

Answer: liquid


Question: Sentence1: if soil is permeable then water easily flows through that soil. 
Sentence2: if soil is permeable then h2o easily flows through the soil.

Answer: flows


Question: Sentence1: Ozone depletion results in higher levels of UV radiation reaching Earth. 
Sentence2: If there is an increase in UV radiation, the risks go up for all types of skin cancer.

Answer:
UV