The possessive form of the noun historian is historian's.
Example: The historian's presentation was very interesting.
The historian is studying Benjamin Franklin.
The plural possessive form is colonists'.
The possessive form for the noun colonist is colonist's.Example: A colonist's day was filled with hard work.
The historian found a marvelous dinosaur fossil that was millions of years old
spies
The singular possessive form is word's, for example the word's definition.
possessive form of the word glass: glass'
possessive form of the word Congress: Congress'
possessive form of the word Cathi: Cathi's
possessive form for the word holders: holders'
The possessive form of the word fairy is fairy's.
The possessive form of the word dictionary is dictionary's.
the possessive form of the word Cathie: Cathie's
The possessive form is Lindbergh's.
The possessive form is weaver's.
The possessive form for the interrogative pronoun who is whose.
The possessive form for the word 'word' is word's.