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: electric devices require electrical energy to function. 
Sentence2: Lie detectors are electrical or mechanical devices.

A: devices
****
Q: Sentence1: when a body of water receives more water than it can hold , a flood occurs. 
Sentence2: Floods are deadly, floods are devastating.

A: flood
****
Q: Sentence1: Invertebrates are animals that lack a vertebral column, or backbone. 
Sentence2: insects are animals that lack a vertebral column, or backbone.

A:
animals
****