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: Light source is an ultra-bright, unbreakable LED Bulb. 
Sentence2: LEDs convert electricity into light and heat energy.
[A]: LED


[Q]: Sentence1: Finally, the fluid in the nephron reaches a collecting duct . 
Sentence2: fluid in the kidneys collect into ducts.
[A]: fluid


[Q]: Sentence1: when an electrical circuit is working properly , electrical current runs through that circuit. 
Sentence2: Electrical power in a circuit is equal to the product of the current and voltage in that circuit.
[A]:
current