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: boiling is when liquids are heated above their boiling point. 
Sentence2: If the pressure is reduced, the boiling point is lowered.

A: boiling
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Q: Sentence1: Clouds are one form of condensation. 
Sentence2: Clouds are one form of changing from a gas into a liquid by reducing heat energy.

A: Clouds
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Q: Sentence1: Blood pressure is highest in arteries and lowest in veins. 
Sentence2: What is Blood Pressure Blood pressure is the pressure on the blood vessel walls.

A:
Blood
****