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.

Q: Sentence1: nectar is used for attracting pollinators by plants. 
Sentence2: butterflies pollinate plants.

A: plants
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Q: Sentence1: Ozone depletion results in higher levels of UV radiation reaching Earth. 
Sentence2: less ozone means more ultraviolet light.

A: Ozone
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Q: Sentence1: smoking tobacco decreases stamina. 
Sentence2: Smoking tobacco may cause low-grade anemia resulting in low stamina.

A:
smoking
****