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: Germination depends on the seed coat. 
Sentence2: the force of water causes germination with the emergence of a root.
[EX A]: Germination

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

[EX Q]: Sentence1: plant reproduction requires pollination. 
Sentence2: Pollination is by flies, wasps, and bees.
[EX A]:
pollination