TASK DEFINITION: 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.
PROBLEM: Sentence1: Scyphozoans are the next group of Cnidarians, and they are the familiar jellyfish. 
Sentence2: Scyphozoans are aquatic organisms.

SOLUTION: Scyphozoans

PROBLEM: Sentence1: the ovaries are used in reproduction. 
Sentence2: Egg released by the ovary.

SOLUTION: ovaries

PROBLEM: Sentence1: hydropower requires damming a river. 
Sentence2: hydropower requires devastating a river.

SOLUTION:
hydropower