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 "pa nub".
Words that have a pure rhyme on their last syllable only.
carob
    cherub
      Arab
        Golub
          Holub
            arab
              scarab

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                Words that "almost" rhyme on the vowel-based rhyme sound of the stressed syllable like: be/eat or maybe/shapely.
                washtub
                  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 "pa nub".