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: Sweat glands produce more sweat. 
Sentence2: When the body is hot, something coming from a gland is produced to cool the body.

SOLUTION: glands

PROBLEM: Sentence1: Any antigen that causes an allergy is called an allergen. 
Sentence2: Antigens are proteins foreign to the body.

SOLUTION: antigen

PROBLEM: Sentence1: Thyroid hormone regulates the body's metabolism. 
Sentence2: metabolism is regulated by hormones.

SOLUTION:
hormone