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 "racetrack".
Words that have a pure rhyme on their last syllable only.
amtrack
    Amtrak
      payback
        playback
          netback
            setback

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              Words that "almost" rhyme on the vowel-based rhyme sound of the stressed syllable like: be/eat or maybe/shapely.
              payback
                playback
                  maniac
                    egomaniac
                      nymphomaniac
                        megalomaniac
                          haystack
                            paperback
                              razorback
                                Rhymes made up of more than one word. For instance, "jealous" and "tell us" or "shaky" and "make me."