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: Bacteria and Viruses Bacteria and viruses can cause diseases. 
Sentence2: bacteria can have a negative impact on an organism.
Bacteria

Sentence1: Basically the process is pretty simple. 
Sentence2: All cells share some of the same structures and simple processes.
process

Sentence1: sandpaper is used to smooth wooden objects. 
Sentence2: Sandpaper is used to smooth log cabins.

sandpaper