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: hiding can be used for avoiding predators. 
Sentence2: Camouflage is used for avoiding predators.
[EX A]: avoiding

[EX Q]: Sentence1: Habitat destruction is the primary cause of extinction or threat of extinction for all animals. 
Sentence2: building housing developments may cause extinction.
[EX A]: extinction

[EX Q]: Sentence1: Cancer is a disease in which cells divide out of control. 
Sentence2: Cancer is also caused by a mutation.
[EX A]:
Cancer