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 Input:
Sentence1: when a body of water receives more water than it can hold , a flood occurs. 
Sentence2: Floods are deadly, floods are devastating.

Ex Output:
flood


Ex Input:
Sentence1: freezing means changing from a liquid into a solid by reducing heat energy. 
Sentence2: Water freezes into ice when cooled.

Ex Output:
freezing


Ex Input:
Sentence1: Climate is the average weather in an area over a long period of time. 
Sentence2: Climate is the average weather in a place over a long period of time.

Ex Output:

Climate