administrator vs decision maker

administrator and decision maker both are nouns.

Word	Noun	Adjective	Verb	Adverb
administrator	Yes	No	No	No
decision maker	Yes	No	No	No

As nouns, administrator and decision maker are synonyms defined as:

administrator (noun)	decision maker (noun)
someone who administers a business	someone who administers 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