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: Dams are very damaging to rivers. 
Sentence2: Creating a lake can be very damaging to rivers.
[A]: damaging


[Q]: Sentence1: Flatworms Flatworms or Platyhelminthes include flukes, tapeworms, and turbellarians. 
Sentence2: Tapeworms belong to the phylum Platyhelminthes.
[A]: tapeworms


[Q]: Sentence1: Caecilians can be found in moist soil near rivers and streams in tropical regions. 
Sentence2: Reptilians can be found in moist soil near rivers and streams in tropical regions.
[A]:
and