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

Sentence1: Cells are the units of function in living things. 
Sentence2: living things cannot survive without oxygen.
living

Sentence1: Viruses are not affected by antibiotics. 
Sentence2: The flu is not affected by antibiotics, only a vaccine.

affected