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.

Sentence1: Annelids have the amazing capacity to regrow segments that break off. 
Sentence2: Earthworms can regrow segments that break off.
break

Sentence1: Mollusks are invertebrates such as the common snail. 
Sentence2: snails have no backbone.
snail

Sentence1: Some arthropods have special excretory structures. 
Sentence2: All insects are arthropods.

arthropods