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.

Sentence1: a sifter is used for separating mixtures. 
Sentence2: a sifter is used for some recipes.
sifter

Sentence1: If there is an increase in UV radiation, the risks go up for all types of skin cancer. 
Sentence2: Ozone depletion increases the risks for all types of skin cancer.
all

Sentence1: Supersonic transport is a viable means of transportation. 
Sentence2: With technology, people can be moved at supersonic speeds.

Supersonic