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 "gadfly".
Words that have a pure rhyme on their last syllable only.
walleye
    Dalai
      wifi
        hifi
          reclassify
            unclassify

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              Words that "almost" rhyme on the vowel-based rhyme sound of the stressed syllable like: be/eat or maybe/shapely.
              reclassify
                unclassify
                  gratify
                    ratify
                      stratify
                        classify
                          pacify
                            declassify

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                              Rhymes made up of more than one word. For instance, "jealous" and "tell us" or "shaky" and "make me."