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: Flatworms Flatworms or Platyhelminthes include flukes, tapeworms, and turbellarians. 
Sentence2: Tapeworms belong to the phylum Platyhelminthes.
tapeworms

Sentence1: Information on DNA is organized into genes. 
Sentence2: DNA codes for proteins.
DNA

Sentence1: Soils are sand, clay, limestone, and organic deposits. 
Sentence2: Soil, sand, clay and limestone can form stalactites.

Soils