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: Most people know that the Venus Flytrap is a carnivorous plant. 
Sentence2: The Venus Flytrap has specialized reproductive organs.

Ex Output:
Flytrap


Ex Input:
Sentence1: Light source is an ultra-bright, unbreakable LED Bulb. 
Sentence2: LEDs convert electricity into light and heat energy.

Ex Output:
LED


Ex Input:
Sentence1: looking at bright objects has a negative impact on the eyes. 
Sentence2: looking at stars negatively impacts the eyes.

Ex Output:

eyes