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: Lymph is a fluid that leaks out of capillaries into spaces between cells. 
Sentence2: Humans are made up of trillions of cells.

SOLUTION: cells

PROBLEM: Sentence1: Ground tissue makes up most of the interior of a plant. 
Sentence2: ground tissue makes up most of the interior of a dandelion.

SOLUTION: Ground

PROBLEM: Sentence1: TRH stimulates the pituitary gland to produce thyroid-stimulating hormone, or TSH. 
Sentence2: TRH stimulates prolactin release.

SOLUTION:
TRH