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.

[EX Q]: Sentence1: Runoff water is wasted water. 
Sentence2: Streams may start with wasted water.
[EX A]: wasted

[EX Q]: Sentence1: Mammals depend on the vegetation for food and shelter. 
Sentence2: Mammals are Heterotrophs.
[EX A]: Mammals

[EX Q]: Sentence1: a plant requires sunlight to grow. 
Sentence2: The nature of sunlight Sunlight is electromagnetic energy.
[EX A]:
sunlight