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: Some viruses live in a dormant state inside the body. 
Sentence2: a virus can live in the brain.
[EX A]: viruses

[EX Q]: Sentence1: Some mollusks are nearly microscopic. 
Sentence2: Some squids are nearly microscopic.
[EX A]: Some

[EX Q]: Sentence1: sound can be used for communication by animals. 
Sentence2: Vibrations can be used for communication by animals.
[EX A]:
animals