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: Water erosion has similar consequences as wind erosion. 
Sentence2: exposure to water can cause erosion.
Water

Sentence1: Hydrogen bonds cause water to expand when it freezes. 
Sentence2: Hydrogen bonds Hydrogen bonds are primarily electrostatic in origin.
Hydrogen

Sentence1: Animals can communicate with sounds, chemicals, or visual cues. 
Sentence2: Monkeys communicate with sounds, chemicals or visual cues.

chemicals