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: Mammalian predators include the coyote and bobcat. 
Sentence2: a coyote's teeth is important for digestion.

A: coyote
****
Q: Sentence1: Rivers, rainwater, well water and most lakes contain fresh water. 
Sentence2: canyons are formed by rainwater.

A: rainwater
****
Q: Sentence1: Early mammals coexisted with dinosaurs throughout the Mesozoic era. 
Sentence2: mammals existed in the mesozoic era.

A:
Mesozoic
****