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 up".
Words that have a pure rhyme on their last syllable only.
Jessup
    Jesup
      breakup
        makeup
          shakeup
            wakeup
              stirrup
                syrup

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                  Words that "almost" rhyme on the vowel-based rhyme sound of the stressed syllable like: be/eat or maybe/shapely.
                  breakup
                    makeup
                      shakeup
                        wakeup
                          There are no near rhymes for "pace up".
                          Rhymes made up of more than one word. For instance, "jealous" and "tell us" or "shaky" and "make me."