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

A: good
****
Q: Sentence1: Electrical currents cause magnetic fields. 
Sentence2: Electrical currents can cause objects to repel each other.

A: Electrical
****
Q: Sentence1: Algae play significant roles as producers in aquatic ecosystems. 
Sentence2: simple green plants play significant roles as producers in aquatic ecosystems.

A:
aquatic
****