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 "y plural s".
Words that have a pure rhyme on their last syllable only.
keyless
    treeless
      Quiles
        Corrales
          Nogales
            DeGeneres
              Serres

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                Words that "almost" rhyme on the vowel-based rhyme sound of the stressed syllable like: be/eat or maybe/shapely.
                flyless
                  digests
                    sightless
                      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 "y plural s".