Pronunciation for vs pronunciation of

There are two https://dictionary.cambridge.org/dictionary/english/acceptable pronunciations for the word "either."
https://dictionary.cambridge.org/dictionary/english/pronunciation
Shouldn't there the preposition "of" be after "pronunciation"?

Which sense of the preposition "for" is used in " pronunciations for the word...."?
What do the phrases "Pronunciations for" and " pronunciations of" mean?