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: Mammals that are viviparous are called therian mammals. 
Sentence2: Mouse-sized viviparous mammals evolved by Jurassic times.

A: Mammals
****
Q: Sentence1: Viruses contain DNA but not much else. 
Sentence2: viruses contain encoded information but not much else.

A: Viruses
****
Q: Sentence1: Man's survival depends on water. 
Sentence2: men need water to live.

A:
Man's
****