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.

[EX Q]: Sentence1: Light source is an ultra-bright, unbreakable LED Bulb. 
Sentence2: LEDs convert electricity into light and heat energy.
[EX A]: LED

[EX Q]: Sentence1: Ground tissue makes up most of the interior of a plant. 
Sentence2: ground tissue makes up most of the interior of a dandelion.
[EX A]: Ground

[EX Q]: Sentence1: Cell division involves a form of mitosis. 
Sentence2: cytokinesis is the final stage of mitosis in eukaryotes as well as prokaryotes.
[EX A]:
mitosis