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.

Sentence1: Boiling water can cause burns. 
Sentence2: heating water can cause burns.
water

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

Sentence1: Electricity A kWh is a unit of electricity. 
Sentence2: A generator converts kinetic energy into kWh.

kWh