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: if soil is permeable then water easily flows through that soil. 
Sentence2: if soil is permeable then h2o easily flows through the soil.

SOLUTION: flows

PROBLEM: Sentence1: propulsion is used for flying by a spacecraft. 
Sentence2: When Apollo 12 took off, the spacecraft was hit by lightning.

SOLUTION: spacecraft

PROBLEM: Sentence1: better senses have a positive impact on an animal 's survival. 
Sentence2: All animals rely on senses of taste and smell to find acceptable food for survival.

SOLUTION:
senses