No, the word who's is a contraction, a shortened form of the pronoun 'who' and the verb 'is'.
The contractions who's functions as a subject and verb (or auxiliary verb) in a sentence.
Example: Who is next? Or: Who's next.
The possessive form of the pronoun 'who' is whose.
Example: Whose job is it to walk the dog?
The singular possessive is fish's.
Buzz's is the singular possessive.
The possessive form is Amos's.
Mary's is the singular possessive form.
The singular possessive form is foot's.
The possessive form of the singular noun husband is husband's.Example: My husband's job involves a lot of travel.
The possessive form of the singular noun person is person's.Example: A person's job does not necessarily define that person.
The possessive form of the singular noun senator is senator's.Example: I got the summer job as a senator's intern.
Quantum is singular, not singular possessive. The singular possessive form is quantum's.
Museum is singular. Museum's is singular possessive. Museums is plural. Museums' is plural possessive.
The singular possessive pronouns are "my," "mine," "your," "yours," "his," "her," and "its."
The singular possessive of dish is dish's
The singular possessive is Martin's.
The singular possessive is fish's.
Grave's is the singular possessive.
The singular possessive form of "test" is "test's".
Buzz's is the singular possessive.