Incorrect spelling, explanation: cardinal number 33 ends with 3, therefore the suffix added to create the ordinal number is according to it, therefore it is -rd. The regular suffix for ordinal number is -th, but numbers 1, 2 and 3 have their own suffixes, thus every number ending with them will end with their suffix (-st, -nd or -rd). Therefore 33rd is the correct form and
33th is wrong.
Correct spelling, explanation: there are four suffixes for ordinal numbers: the regular one is -th, and three reserved for 1, 2 and 3 – respectively -st, -nd and -rd. As number 33 ends with 3 the suffix for ordinal number will be -rd (thirty-third).
Definition of 33rd:
numeral, ordinal number between 32nd and 34th
We plan a surprise party for Jack’s 33rd birthday.
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