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You can always wrap the word and superscript in a <span> with "whitespace: nowrap", but I believe that's adding clutter to work around a problem of some specific renderer (which shouldn't be inserting a linebreak at a subscript or supescript).
However (from the CSS spec):
Note. CSS 2.1 does not fully define where line breaking opportunities occur. Floated and absolutely-positioned elements do not introduce a line breaking opportunity.
This means that the renderer is not going against the spec (just against common sense), so using the span might be justified. Anyway, I wouldn't do that, I'd complain to the vendor/developer instead.
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