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: Climate Forests stabilize climate. 
Sentence2: forests stabilize what is generally described in terms of temperature and moisture.

Ex Output:
Forests


Ex Input:
Sentence1: Cnidarians have a hydrostatic skeleton. 
Sentence2: Jellyfish have a hydrostatic skeleton.

Ex Output:
hydrostatic


Ex Input:
Sentence1: adding salt to a liquid decreases the melting point of that liquid. 
Sentence2: A low melting point will lower the heat needed.

Ex Output:

melting