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 "pack a bag".
Words that have a pure rhyme on their last syllable only.
handbag
    sandbag
      body bag
        bodybag
          ag
            bag
              brag
                dag
                  drag
                    fag
                      flag
                        gag
                          hag
                            lag
                              mag
                                nag
                                  rag
                                    sag
                                      shag
                                        slag
                                          snag
                                            stag
                                              tag
                                                wag
                                                  zag
                                                    crag
                                                      jag
                                                        reflag
                                                          Bagge
                                                            Blagg
                                                              Bragg
                                                                Flagg
                                                                  Hagg
                                                                    Kragh
                                                                      Stagg

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                                                                        Words that "almost" rhyme on the vowel-based rhyme sound of the stressed syllable like: be/eat or maybe/shapely.
                                                                        handbag
                                                                          sandbag
                                                                            ragtag
                                                                              saddlebag
                                                                                Cavanagh
                                                                                  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 "pack a bag".