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.

Sentence1: Eggs are usually laid in a nest. 
Sentence2: birds have nests.
nest

Sentence1: All photos are digital images. 
Sentence2: satellites are used to take photos from space.
photos

Sentence1: Marine life refers to the species of animals, plants, and other organisms that live in the ocean. 
Sentence2: Animals and plants that live in the ocean live mainly in shallow coastal waters.

animals