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.

Q: Sentence1: Aggression is behavior that is intended to cause harm or pain. 
Sentence2: Verbal violence is behavior that is intended to cause harm or pain.

A: behavior
****
Q: Sentence1: Veins generally carry deoxygenated blood. 
Sentence2: Blood carries blood cells.

A: blood
****
Q: Sentence1: Algae Algae Green algae are the simplest of green plants. 
Sentence2: the simplest green plants have varied life cycles.

A:
green
****