How to prevent Str::plural() from doing non-words and wrong words

[zvit]

Is there a way to tell the Str::plural() function not to pluralize words that result in non-existing words, or words that are not words but acronyms and don't need pluralization? For example, these are some of the results I get, where I wish the function would have kept the original words intact:

achieved => achieveds
financially => financiallies
ptosis => ptoses
AAA => AAAS

Thanks!