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 "pacifists".
Words that have a pure rhyme on their last syllable only.
dentist's
    dentists
      hygienists
        receptionists
          receptionists
            impressionists
              secessionists

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                Words that "almost" rhyme on the vowel-based rhyme sound of the stressed syllable like: be/eat or maybe/shapely.
                analyst's
                  analysts
                    panelists
                      nationalists
                        internationalists
                          internationalists
                            evangelists
                              evangelists

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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 "pacifists".