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: Weather Clear weather usually means good visibility. 
Sentence2: High pressure systems can cause good visibility.

SOLUTION: good

PROBLEM: Sentence1: high pressure systems cause clear weather. 
Sentence2: Weather Clear weather usually means good visibility.

SOLUTION: clear

PROBLEM: Sentence1: astronauts require preserved food for extended flights. 
Sentence2: Mostly for reasons of preservation, some food is dehydrated for consumption here on Earth.

SOLUTION:
preserved