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: Osteoporosis is a disease in which osteoclasts are more active than osteoblasts. 
Sentence2: a thinning and weakening of bone is a disease in which osteoclasts are more active than osteoblasts.

Ex Output:
active


Ex Input:
Sentence1: weathering means breaking down rocks from larger whole into smaller pieces by weather. 
Sentence2: Larger values create bigger brushes.

Ex Output:

larger