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: Interstellar space contains a plasma. 
Sentence2: interstellar space contains electrons, atoms, and stars.
[A]: Interstellar


[Q]: Sentence1: a greenhouse is used to protect plants by keeping them warm. 
Sentence2: Flower size varies by plant.
[A]: plants


[Q]: Sentence1: Yet most consumers are unaware that they are endangering species in the wild. 
Sentence2: Most organisms are endangering species in the wild.
[A]:
endangering