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 words".
Words that have a pure rhyme on their last syllable only.
coward's
    cowards
      Howard's
        collards
          Pollard's
            oxfords
              Oxford's

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                Words that "almost" rhyme on the vowel-based rhyme sound of the stressed syllable like: be/eat or maybe/shapely.
                collards
                  Pollard's
                    oxfords
                      Oxford's
                        onwards
                          Barnard's
                            Harvard's
                              Hartford's
                                Robards
                                  Stoddard's
                                    Concord's
                                      Rhymes made up of more than one word. For instance, "jealous" and "tell us" or "shaky" and "make me."