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 "r o one".
Words that have a pure rhyme on their last syllable only.
fortune
    misfortune
      heroin
        heroine
          portion
            abortion
              apportion
                contortion
                  distortion
                    extortion
                      proportion
                        antiabortion

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                          Words that "almost" rhyme on the vowel-based rhyme sound of the stressed syllable like: be/eat or maybe/shapely.
                          Johnathon
                            Jonathan
                              Jonathon
                                Harshman
                                  Marshman
                                    Cochran
                                      Cochrane

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                                        Rhymes made up of more than one word. For instance, "jealous" and "tell us" or "shaky" and "make me."