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 "raccoon rex".
Words that have a pure rhyme on their last syllable only.
latex
    Playtex
      cortex
        vortex
          project's
            projects

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              Words that "almost" rhyme on the vowel-based rhyme sound of the stressed syllable like: be/eat or maybe/shapely.
              duplex
                unisex
                  Uzbeks
                    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 "raccoon rex".