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: if an object is made of a material then that object has the properties of that material. 
Sentence2: An object is an item in the real world.
object

Sentence1: a circle graph can be used to display percents. 
Sentence2: Pie Charts Pie charts are used predominantly to show percentages or parts of a whole.

percents