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: a plant requires sunlight to grow. 
Sentence2: Grass needs air and sunlight.
[EX A]: sunlight

[EX Q]: Sentence1: Organisms that live in marine biomes must be adapted to the salt in the water. 
Sentence2: Most of the water on the planet is salt water in the oceans.
[EX A]: salt

[EX Q]: Sentence1: Contact with a source of electrical energy can cause external as well as internal burns. 
Sentence2: A generator converts kinetic energy into a source of energy that can cause external as well as internal burns.
[EX A]:
burns