When writing twentieth century using an ordinal numeral, should the th part be in superscript? Length, width, breadth, depth, wealth, girth,. For example 9th 3rd 301st what do we call these special sounds?
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Given that the two th sounds don't actually sound like a combination of t and h why was that particular combination selected or become adopted by the majority ? The former is unvoiced, while the latter is voiced. Consider the th in thistle versus the th in this:
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Height, weight, thought, drought, sleight, sight all end with ‑ht.
Some words end with ‑th while others end with ‑ht. Is there a rule or reason for the differences? When were numeric contractions for ordinals first used, as in 1st, 2nd, 3rd, 6th instead of first, second, third, sixth?