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Eighth (the ordinal numeral 8th) is spelled this way - with two '-h-'s.

Both are necessary, the first to preserve the spelling of the cardinal eight and the second to show the pronunciation (IPA: /θ/) of the final consonant, -th.
Oddly, there is no second '-t-' to indicate the RP pronunciation with both a '-t-' (/t/) and '-th' (/θ/) sound.