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 "pace oval".
Words that have a pure rhyme on their last syllable only.
naval
    navel
      oval
        Covel
          Koval
            Scovel
              graceful
                disgraceful

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                  Words that "almost" rhyme on the vowel-based rhyme sound of the stressed syllable like: be/eat or maybe/shapely.
                  naval
                    navel
                      graceful
                        disgraceful
                          facial
                            glacial
                              racial
                                spatial
                                  biracial
                                    nonracial
                                      palatial
                                        interracial
                                          multiracial

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