executive vs administrator

executive and administrator both are nouns.

Word	Noun	Adjective	Verb	Adverb
executive	Yes	Yes	No	No
administrator	Yes	No	No	No

As nouns, administrator is a hypernym of executive; that is, administrator is a word with a broader meaning than executive:

Other hypernyms of executive include decision maker.

As nouns, executive and administrator are synonyms defined as:

executive and administrator: someone who manages a government agency or department

executive (noun)	administrator (noun)
persons who administer the law	someone who administers a business
a person responsible for the administration of a business	the party appointed by a probate court to distribute the estate of someone who dies without a will or without naming an executor
someone who manages a government agency or department	someone who manages a government agency or department

executive (adjective)	administrator (adjective)
having the function of carrying out plans or orders etc.