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: Carpools and vanpools can save time. 
Sentence2: vanpools decrease the amount of cars used to travel to a place.
[EX A]: vanpools

[EX Q]: Sentence1: plant reproduction requires pollination. 
Sentence2: Plant reproduction requires insects and hummingbirds.
[EX A]: plant

[EX Q]: Sentence1: Major route of excretion is in the feces. 
Sentence2: Feces are a major route of removing wastes and excess water from the body.
[EX A]:
Major