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 "yam jams".
Words that have a pure rhyme on their last syllable only.
cam's
    clams
      crams
        dam's
          dams
            drams
              grams
                hams
                  jam's
                    jams
                      lamb's
                        lambs
                          rams
                            scams
                              slams
                                trams
                                  yams
                                    exams
                                      AMS
                                        Am's
                                          Graham's
                                            Grahams
                                              Pam's
                                                Sam's
                                                  Sams
                                                    kilograms
                                                      milligrams
                                                        program's
                                                          programs
                                                            reprograms

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                                                              Words that "almost" rhyme on the vowel-based rhyme sound of the stressed syllable like: be/eat or maybe/shapely.
                                                              mammograms
                                                                nanograms
                                                                  chromatograms
                                                                    Amsterdam's
                                                                      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 "yam jams".