/usr/bin/wnb is in wordnet-gui 1:3.0-33.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 | #!/bin/sh
# This is a simple wrapper to avoid crashes of wnb (closes #484568)
LC_ALL=C /usr/share/wordnet/bin/wnb "$@"
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