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: Homogeneous mixtures are called solutions. 
Sentence2: A homogenous mixture is formed when one substance dissolves in another.
answer:
Homogeneous


question:
Sentence1: smell is used for finding food by some animals. 
Sentence2: Food includes small rodents and birds.
answer:
food


question:
Sentence1: a cavern is formed by carbonic acid in groundwater seeping through rock and dissolving limestone. 
Sentence2: Caverns are formed when acid dissolves limestone, creating a liquid.
answer:

acid