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 "pacemaker".
Words that have a pure rhyme on their last syllable only.
taster
    waster
      bracer
        chaser
          facer
            lacer
              pacer
                placer
                  racer
                    spacer
                      tracer
                        eraser
                          Acer
                            flamer
                              framer
                                gamer
                                  lamer
                                    namer
                                      tamer
                                        disclaimer
                                          reclaimer
                                            Amer
                                              Cramer
                                                Kramer
                                                  Ramer

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                                                    Words that "almost" rhyme on the vowel-based rhyme sound of the stressed syllable like: be/eat or maybe/shapely.
                                                    taster
                                                      waster
                                                        bracer
                                                          chaser
                                                            facer
                                                              lacer
                                                                pacer
                                                                  placer
                                                                    racer
                                                                      spacer
                                                                        tracer
                                                                          eraser
                                                                            Acer
                                                                              flamer
                                                                                framer
                                                                                  gamer
                                                                                    lamer
                                                                                      namer
                                                                                        tamer
                                                                                          disclaimer
                                                                                            reclaimer
                                                                                              Amer
                                                                                                Cramer
                                                                                                  Kramer
                                                                                                    Ramer

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                                                                                                      Rhymes made up of more than one word. For instance, "jealous" and "tell us" or "shaky" and "make me."
                                                                                                      There are no mosaic rhymes for "pacemaker".