Park rangers
The plural is rangers and the plural possessive is rangers' (e.g. The rangers' uniforms were dusty from the long ride.)
The possessive form of the word dictionary is dictionary's.
The singular possessive form is word's, for example the word's definition.
possessive form of the word glass: glass'
The possessive form of the word "month" is "month's."
possessive form of the word Congress: Congress'
possessive form for the word holders: holders'
the possessive form of the word Cathie: Cathie's
possessive form of the word Cathi: Cathi's
The possessive form is weaver's.
The possessive form is Lindbergh's.
The possessive form for the interrogative pronoun who is whose.