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 "yam on".
Words that have a pure rhyme on their last syllable only.
ion
    pion
      Agamemnon
        Memnon
          eon
            freon
              neon
                theone
                  Deion
                    Deon
                      Dione
                        Dionne
                          Geon
                            Gian
                              Leon

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                                Words that "almost" rhyme on the vowel-based rhyme sound of the stressed syllable like: be/eat or maybe/shapely.
                                tampon
                                  baton
                                    axon
                                      heptathlon
                                        astrakhan
                                          antiphon
                                            pantheon
                                              antiphon
                                                magnetron
                                                  orangutan
                                                    Amazon
                                                      Amidon
                                                        Dacron
                                                          Hambleton
                                                            Matewan
                                                              Babylon
                                                                Aharon
                                                                  Avalon
                                                                    Avignon
                                                                      Algernon
                                                                        Rhymes made up of more than one word. For instance, "jealous" and "tell us" or "shaky" and "make me."