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: Antibodies are large, Y-shaped proteins that recognize and bind to antigens. 
Sentence2: Some of the antibodies, antophospholipid antibodies, cause blood clots.

SOLUTION: Antibodies

PROBLEM: Sentence1: melting is when solids are heated above their melting point. 
Sentence2: Ice is a solid, it's cold and it's hard.

SOLUTION: solids

PROBLEM: Sentence1: Adolescence is the last stage of life before adulthood. 
Sentence2: Adolescence is a pivotal stage of human development.

SOLUTION:
Adolescence