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: a circle graph can be used to display percents. 
Sentence2: pie charts are circle graphs.
[EX A]: circle

[EX Q]: Sentence1: Oil and gasoline are fossil fuels. 
Sentence2: lawn mowers convert fossil fuels into motion.
[EX A]: fossil

[EX Q]: Sentence1: Minerals are chemical elements that are essential for body processes. 
Sentence2: salts are are chemical elements that are essential for body processes.
[EX A]:
body