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: Muscles can only contract. 
Sentence2: Contraction is a type of movement.

SOLUTION: contract

PROBLEM: Sentence1: Angiosperm sporophyte is dominant. 
Sentence2: Flowers form on angiosperms.

SOLUTION: Angiosperm

PROBLEM: Sentence1: Combustion generates toxic fumes. 
Sentence2: High temperatures can cause toxic fumes.

SOLUTION:
fumes