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: After about a week the larvae leave the nodules and continue to develop into adult worms. 
Sentence2: larvae leave the nodules and continue to transform until having reproductive organs.

SOLUTION: larvae

PROBLEM: Sentence1: Birds are endothermic tetrapod vertebrates. 
Sentence2: Birds are vertebrate endotherms with legs.

SOLUTION:
Birds