Use WordNet to collect homonyms

Does anyone know whether it is possible to retrieve homonyms of a given word using WordNet (specifically its `NLTK` "interface")?

For example, let's say I'm interested in the word *coach*, which can either refer to a *bus* or a *trainer*. Is there a way, using WordNet, to get a list of homonyms with their respective senses? Something along these lines:

coach: bus, van...
coach: trainer, mentor...

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