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: Plants live just about everywhere on Earth. 
Sentence2: epiphytes live everywhere on earth.

A: everywhere
****
Q: Sentence1: Competition may lead to aggressive behaviors or displays of aggression. 
Sentence2: Aggression Aggression and violence often go together.

A: aggression
****
Q: Sentence1: the movement of an air mass over Earth 's surface causes local weather changes. 
Sentence2: Air mass movements are also influenced by mountain barriers.

A:
air
****