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 stadium".
Words that have a pure rhyme on their last syllable only.
Dahlstrom
    Wahlstrom
      magnetism
        ferromagnetism
          electromagnetism
            multilateralism
              unilateralism

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                Words that "almost" rhyme on the vowel-based rhyme sound of the stressed syllable like: be/eat or maybe/shapely.
                magnetism
                  ferromagnetism
                    electromagnetism
                      multilateralism
                        unilateralism
                          naturalism
                            supernaturalism

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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 "pack a stadium".