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.

Q: Sentence1: Distance is measured in meters the SI unit of distance. 
Sentence2: The SI unit of distance is in meters.

A: SI
****
Q: Sentence1: Cultivation is easier if soil is loose. 
Sentence2: soil with more oxygen is easier to cultivate.

A: Cultivation
****
Q: Sentence1: Migration Much of the life of a spiny lobster involves travel. 
Sentence2: A life involving travel is a type of movement that changes population size.

A:
involves
****