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: People of all ages and activity levels perspire or sweat. 
Sentence2: Perspiration reduces body heat.
[EX A]: perspire

[EX Q]: Sentence1: Dinosaur bones, like many other artifacts, are fossilized. 
Sentence2: radioactive dating is used to determine the age of dinosaur bones.
[EX A]: Dinosaur

[EX Q]: Sentence1: heavy rains cause flooding. 
Sentence2: Fifty to 100 homes are either flooded or in danger of flooding.
[EX A]:
flooding