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: conserving water can be used for survival in a dry environment. 
Sentence2: conserving water can be used for survival in deserts.
[EX A]: conserving

[EX Q]: Sentence1: Most major Atlantic hurricanes start as small disturbances moving westward off Africa. 
Sentence2: When something that starts as a small disturbance moving westward off Africa then moves over land, it will decrease in strength.
[EX A]: Africa

[EX Q]: Sentence1: Cells, the basic units of every living organism, proliferate by binary division. 
Sentence2: Viruses do not proliferate via binary division.
[EX A]:
binary