pyrrole

/ˈpɪɹəʊl/

IPA: /P IH1 R OW0 L/

noun
  1. 1

    Any of a class of aromatic heterocyclic compounds containing a ring of four carbon atoms and a nitrogen atom; especially the simplest one, C4H5N.

Synonyms

Source: https://en.wiktionary.org/wiki/pyrrole