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: An electric current is a flow of electric charge. 
Sentence2: a magnet moving in a coil of copper wire can cause a flow of electric charge.

SOLUTION: charge

PROBLEM: Sentence1: Producers use energy and inorganic molecules to make food. 
Sentence2: Green plants use energy and inorganic molecules to make food.

SOLUTION: energy

PROBLEM: Sentence1: Ants communicate with chemicals called pheromones. 
Sentence2: Pheromones are a sub-category of semiochemicals.

SOLUTION:
pheromones