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.

Sentence1: Plants live just about everywhere on Earth. 
Sentence2: epiphytes live everywhere on earth.
everywhere

Sentence1: Very often their only metal object in the house is a cooking pot or a knife. 
Sentence2: sharpening a knife causes it to change shape.
knife

Sentence1: Some pelycosaurs gave rise to a group of animals called therapsids. 
Sentence2: Pelycosaurs are an important lineage preserved in the fossil record.

pelycosaurs