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: Warm temperatures have helped plant growth and sizing. 
Sentence2: a greenhouse helps  plant growth.

Ex Output:
growth


Ex Input:
Sentence1: Fully cooking oysters kills the bacteria. 
Sentence2: Fully cooking oysters can prevent illness.

Ex Output:
Fully


Ex Input:
Sentence1: Mammals conserve body heat with their hair or fur. 
Sentence2: Mammals include squirrels, muskrats, opposums, and deer.

Ex Output:

Mammals