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: Ejaculation allows males to reproduce. 
Sentence2: propelling sperm from the epididymes allows males to reproduce.
[EX A]: allows

[EX Q]: Sentence1: All sharks are predators. 
Sentence2: hiding can be used for avoiding sharks.
[EX A]: sharks

[EX Q]: Sentence1: Predation is the best documented cause of early mortality, particularly for mobile species. 
Sentence2: hiding can be used for avoiding early mortality.
[EX A]:
early