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.

Example Input: Sentence1: Veins generally carry deoxygenated blood. 
Sentence2: Blood carries blood cells.
Example Output: blood

Example Input: Sentence1: Crops are plants that are grown for food or other uses. 
Sentence2: insects destroy plants.
Example Output: plants

Example Input: Sentence1: This shaking of the crust is called an earthquake. 
Sentence2: shaking of the earths crust is called an earthquake.
Example Output:
crust