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


question:
Sentence1: Graphite and diamond are polymorphs of carbon. 
Sentence2: carbon polymorphs are used for making pencil lead.
answer:
carbon


question:
Sentence1: New cells are then created through cell division. 
Sentence2: Centrioles are organelles involved in creating new cells.
answer:

New