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-'s

-'s /s/ after /p/ /t/ /k/ /f/ or /θ/ /əz/ after /s/ /z/ /ʃ/ /ʒ/ /tʃ/ or /ʤ/ /z/ elsewhere noun suffix or pronoun suffix
-'s
/s/ after /p/ /t/ /k/ /f/ or /θ/ /əz/ after /s/ /z/ /ʃ/ /ʒ/ /tʃ/ or /ʤ/ /z/ elsewhere
noun suffix or pronoun suffix
Britannica Dictionary definition of -'S
used to form the possessive of singular nouns, of plural nouns not ending in s, of some pronouns, and of word groups that function as nouns or pronouns
◊ The possessive of a plural noun that ends in s is formed by adding an apostrophe alone instead of 's.
◊ The possessive of singular nouns and names that end in s can usually be formed by adding 's. If adding 's would make the word difficult to say, an apostrophe alone may be used instead.