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

A: sifter
****
Q: Sentence1: Cancer is a disease in which cells divide out of control. 
Sentence2: Cancer is a disease in which cells grow and divide rapidly.

A: Cancer
****
Q: Sentence1: waxy leaves are used for storing water by some plants. 
Sentence2: Bromeliads store water in their waxy leaves.

A:
storing
****