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: a wildfire changes an ecosystem drastically. 
Sentence2: Forest fires change an ecosystem drastically.

A: changes
****
Q: Sentence1: plant requires seed dispersal for reproduction. 
Sentence2: plants are pollinated by birds.

A: plant
****
Q: Sentence1: Electrical engineers work on power plants, computers, and other electrical devices. 
Sentence2: Computers use electricity as an energy source.

A:
computers
****