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.

Sentence1: moss causes chemical weathering. 
Sentence2: Sphagnum moss mixed with peat moss.
moss

Sentence1: Damage is intensified by moisture stress during drought. 
Sentence2: low amounts of rainfall intensify damage during drought.
Damage

Sentence1: All cnidarians are aquatic. 
Sentence2: Aquatic animals moving through water are also subject to the principles of aerodynamics.

aquatic