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: Contact with infected blood, contaminated needles. 
Sentence2: scraping oneself on an infected needle may cause infection.

SOLUTION: infected

PROBLEM: Sentence1: Heat and temperature are the same. 
Sentence2: a thermometer is used to measure heat.

SOLUTION: Heat

PROBLEM: Sentence1: plant requires seed dispersal for reproduction. 
Sentence2: Plant reproduction depends on grains being planted.

SOLUTION:
plant