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: cell division often causes growth. 
Sentence2: Cell division leads to reproduction.
cell

Sentence1: Thrinaxodon, a small Lystrosaurus Zone cynodont, shows many of the characters of the group. 
Sentence2: Thrinaxodon is from the animal family that eventually evolved into mammals.
Thrinaxodon

Sentence1: Food poisoning occurs when spoiled food is eaten. 
Sentence2: Microorganisms cause food poisoning.

Food