TASK DEFINITION: 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.
PROBLEM: Sentence1: Plants exhibit phototropism, or growing toward a light source. 
Sentence2: Phototropism means growing toward the energy of light.

SOLUTION: phototropism

PROBLEM: Sentence1: Combustion generates toxic fumes. 
Sentence2: High temperatures can cause toxic fumes.

SOLUTION: fumes

PROBLEM: Sentence1: Adult worms go through a major transformation to develop reproductive organs. 
Sentence2: An enlarged cummerbund-like band near the worm's head holds the reproductive organs.

SOLUTION:
organs