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 Input:
Sentence1: Dromaeosaurs are part of the theropod group of dinosaurs. 
Sentence2: Birds evolved from a group of bipedal dinosaurs that included Dromaeosaurs.

Ex Output:
Dromaeosaurs


Ex Input:
Sentence1: if an organism becomes too hot then that organism may die. 
Sentence2: a plant can collapse if it gets too hot.

Ex Output:
hot


Ex Input:
Sentence1: Cnidarians include jellyfish and anemones. 
Sentence2: All jellyfish are aquatic.

Ex Output:

jellyfish