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: propulsion is used for flying by a spacecraft. 
Sentence2: Jets are used for flying by spacecraft.
[EX A]: flying

[EX Q]: Sentence1: when a body of water receives more water than it can hold , a flood occurs. 
Sentence2: Floods are deadly, floods are devastating.
[EX A]: flood

[EX Q]: Sentence1: Male dogs use pheromones in urine to mark their territory. 
Sentence2: Male dogs use urine to mark their territory the same way as they find mates.
[EX A]:
Male