WikiRhymer has about 8,000 rhyming words and phrases for "thirty" starting with...

birdie
    birdy
      nerdy
        purdy
          sturdy
            wordy
              Ciardi
                Ferdie
                  McCurdy
                    Verde
                      Pure Rhyme Set #1 of 1 (Add to/Edit Set Members)
                      Words that have a pure rhyme on their last syllable only.
                      pair d
                        Verdi
                          End Rhyme Set #1 of 995 (Add to/Edit Set Members)
                          petri
                            Petrey
                              Petrie
                                End Rhyme Set #2 of 995 (Add to/Edit Set Members)
                                thirdly
                                  absurdly
                                    Eardley
                                      End Rhyme Set #3 of 995 (Add to/Edit Set Members)

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                                      Words that "almost" rhyme on the vowel-based rhyme sound of the stressed syllable like: be/eat or maybe/shapely. (Click for more info)
                                      thirdly
                                        absurdly
                                          Eardley
                                            Near Rhyme Set #1 of 38 (Add to/Edit Set Members)
                                            worthy
                                              unworthy
                                                Near Rhyme Set #2 of 38 (Add to/Edit Set Members)
                                                dirty
                                                  thirty
                                                    curty
                                                      flirty
                                                        Bertie
                                                          Berty
                                                            Gertie
                                                              Gerty
                                                                • get your hands dirty
                                                                Near Rhyme Set #3 of 38 (Add to/Edit Set Members)

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

                                                                We have no mosaic rhymes for "thirty".

                                                                Mosaic Rhyme Set #1 of 1 (Add to/Edit Set Members)