TASK DEFINITION: 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.
PROBLEM: Sentence1: evaporation can be used for separating a solute from a solvent in a solution. 
Sentence2: Evaporation can be used for segregation a solute from a solvent in a solution.

SOLUTION: a

PROBLEM: Sentence1: ultraviolet light causes sunburn. 
Sentence2: Sunburn risk is higher at elevation.

SOLUTION: sunburn

PROBLEM: Sentence1: when a river floods , that river deposits soil in flood plains. 
Sentence2: Minerals are the constituents of rocks, sediments, and soils.

SOLUTION:
soil