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: the uterus is used in reproduction. 
Sentence2: Reproduction uses the same organ as menstruation.

SOLUTION: reproduction

PROBLEM: Sentence1: All frogs are amphibians. 
Sentence2: frogs have permeable skin that easily absorbs substances from the environment.

SOLUTION: frogs

PROBLEM: Sentence1: Most disinfectants contain organic solvents that are flammable and poisonous. 
Sentence2: Most disinfectants contain solvents that can harm living things.

SOLUTION:
Most