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: After about a week the larvae leave the nodules and continue to develop into adult worms. 
Sentence2: larvae leave the nodules and continue to transform until having reproductive organs.
[EX A]: larvae

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

[EX Q]: Sentence1: bacteria can cause people to become ill. 
Sentence2: bacteria can be infectious and cause people to need recovery.
[EX A]:
bacteria