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: Specialization decreases mortality 12,13 and increases survival. 
Sentence2: evolving different adaptations increases survival.
Example Output: increases

Example Input: Sentence1: Earthquakes cause massive damage. 
Sentence2: tectonic plates being pushed together causes massive damage.
Example Output: damage

Example Input: Sentence1: Bryophytes Bryophytes include the mosses, liverworts, and hornworts. 
Sentence2: mosses depend on moisture to reproduce.
Example Output:
mosses