The word "who's" is a contraction, a shortened form of the pronoun "who" and the verb "is".
In order to make a correct sentence, the noun "job" will have to be the name of a person (Job).
Example: Who is Job? Or: Who'sJob?
What you really need is the possessive form of the pronoun "who".
The possessive form is whose.
Example: Whose job is it to wash the dishes?
Communicative
The word job is a noun.
A statement, also a line of dialogue in a script. It is not a part of speech which is the job or function of a word within a sentence or question.
Career is a noun. It defines someone's ongoing job.
Career is a noun. It defines someone's ongoing job.
The word occupation is a noun. An occupation is another term for a job.
Main Entry: spinster Part of Speech: nounDefinition: unmarried woman
The part of speech for this particular word is a noun.
part of speech
The part of speech for "answer" is a noun.
what part of speech is beneath
adverb