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: Asbestos is a dangerous carcinogen. 
Sentence2: Asbestos causes cancer.

Ex Output:
Asbestos


Ex Input:
Sentence1: adding salt to a solid decreases the freezing point of that solid. 
Sentence2: Water density decreases with temperature and increases with salt content.

Ex Output:
decreases


Ex Input:
Sentence1: Insect Pollinators Learn about pollination and why insect pollinators are important in the garden. 
Sentence2: insect are important in the fertilization step in the sexual reproduction of plants.

Ex Output:

Insect