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: Amphibians have permeable skin that easily absorbs substances from the environment. 
Sentence2: permeable skin easily absorbs air to breathe through.

Ex Output:
absorbs


Ex Input:
Sentence1: Warm temperatures have helped plant growth and sizing. 
Sentence2: a greenhouse helps  plant growth.

Ex Output:
growth


Ex Input:
Sentence1: Kinetic energy varies as the square of the speed of a moving body. 
Sentence2: Applying force in the direction of travel of a moving object will increase its kinetic energy.

Ex Output:

Kinetic