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: disease-causing microbes have a negative impact on the body. 
Sentence2: pathogens have a negative impact on the body.
[EX A]: body

[EX Q]: Sentence1: Telephone Telephone calls are expensive. 
Sentence2: Communicating by transmitting sound is expensive.
[EX A]: expensive

[EX Q]: Sentence1: Fingernails are also made of keratin. 
Sentence2: Keratin forming over the ends of fingers prevents injury.
[EX A]:
keratin