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 solution is formed by one substance being dissolved in another substance. 
Sentence2: A solution is formed when limestone is dissolved in ocean water.
[EX A]: formed

[EX Q]: Sentence1: a stopwatch is used to measure time. 
Sentence2: Time can be measured with a clock or watch.
[EX A]: measure

[EX Q]: Sentence1: Meiosis, on the other hand, is a two stage process, ultimately producing four cells. 
Sentence2: A two stage process is the type of cell division that produces gametes.
[EX A]:
process