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: adding salt to a solid decreases the freezing point of that solid. 
Sentence2: Water density decreases with temperature and increases with salt content.
[A]: decreases


[Q]: Sentence1: Aggression is behavior that is intended to cause harm or pain. 
Sentence2: Verbal violence is behavior that is intended to cause harm or pain.
[A]: behavior


[Q]: Sentence1: Oxygen is essential for cellular respiration for all aerobic organisms. 
Sentence2: Oxygen is essential for fungi cellular respiration.
[A]:
Oxygen