Generate a topic word for the given sentence. A topic word is usually the name of a person, place, animal, concept or object the sentence is focusing on.

[EX Q]: warluzel is a commune.
[EX A]: warluzel

[EX Q]: morsain is a commune.
[EX A]: morsain

[EX Q]: the malacostraca (greek: "soft shell") are the largest subgroup of crustaceans.
[EX A]:
malacostraca