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: Marine dolphins are endangered by fishing nets, speedboats, and pollution. 
Sentence2: dolphins live mainly in shallow coastal waters.
[EX A]: dolphins

[EX Q]: Sentence1: Mollusks are invertebrates such as the common snail. 
Sentence2: Another common snail is the decollate snail.
[EX A]: snail

[EX Q]: Sentence1: For example, the sun releases energy needed to drive photosynthesis. 
Sentence2: The sun releases energy needed for plants to grow.
[EX A]:
energy