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 "r u shure".
Words that have a pure rhyme on their last syllable only.
boor
    buhr
      cure
        jure
          lure
            moor
              poore
                pure
                  shure
                    spoor
                      sure
                        tour
                          ur
                            you're
                              your
                                allure
                                  assure
                                    bonjour
                                      brochure
                                        couture
                                          demure
                                            detour
                                              endure
                                                ensure
                                                  impure
                                                    insure
                                                      inure
                                                        manure
                                                          mature
                                                            obscure
                                                              procure
                                                                secure
                                                                  unsure
                                                                    amour
                                                                      d'amour
                                                                        l'amour
                                                                          immature
                                                                            premature
                                                                              reassure
                                                                                reinsure
                                                                                  entrepreneur
                                                                                    Baldur
                                                                                      Damour
                                                                                        Gilmour
                                                                                          Latour
                                                                                            Lumpur
                                                                                              Moore
                                                                                                Muir
                                                                                                  Ruhr
                                                                                                    contour
                                                                                                      detour
                                                                                                        saviour
                                                                                                          paramour
                                                                                                            epicure
                                                                                                              miniature
                                                                                                                miniature
                                                                                                                  Artur
                                                                                                                    Niebuhr
                                                                                                                      Words that "almost" rhyme on the vowel-based rhyme sound of the stressed syllable like: be/eat or maybe/shapely.
                                                                                                                      contour
                                                                                                                        Artur
                                                                                                                          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 "r u shure".