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.

[EX Q]: Sentence1: boiling is when liquids are heated above their boiling point. 
Sentence2: If the pressure is reduced, the boiling point is lowered.
[EX A]: boiling

[EX Q]: Sentence1: cell division often causes growth. 
Sentence2: Cell division leads to reproduction.
[EX A]: cell

[EX Q]: Sentence1: hurricanes convert heat energy into mechanical energy. 
Sentence2: Andrew and Fran both had energy.
[EX A]:
energy