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: Endospores are commonly found in soil and water. 
Sentence2: Dirt is really misplaced soil.

Ex Output:
soil


Ex Input:
Sentence1: if soil is permeable then water easily flows through that soil. 
Sentence2: The increase in permeability is caused by the formation and expansion of ice in the soil.

Ex Output:
permeable


Ex Input:
Sentence1: Often habitat is destroyed for agriculture. 
Sentence2: agriculture can result in animals moving to another area from their home area.

Ex Output:

agriculture