Words that have identical vowel-based rhyme sounds in the tonic syllable. Moreover, that tonic syllable must start with a different consonantal sound.
There are no pure rhymes for "nah ion".
Words that have a pure rhyme on their last syllable only.
ion
    pion
      argon
        Argonne
          icon
            daikon
              Icahn
                Nikon

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                  Words that "almost" rhyme on the vowel-based rhyme sound of the stressed syllable like: be/eat or maybe/shapely.
                  argon
                    Argonne
                      pompon
                        octagon
                          positron
                            polygon
                              polygon
                                automaton
                                  phenomenon
                                    chlorofluorocarbon
                                      Narayan
                                        Ofallon
                                          Ramadan
                                            Comecon
                                              Farrakhan
                                                Parmesan
                                                  Alarcon
                                                    Arbitron
                                                      Bohannon
                                                        Parthenon
                                                          Rhymes made up of more than one word. For instance, "jealous" and "tell us" or "shaky" and "make me."
                                                          There are no mosaic rhymes for "nah ion".