The phrase "administrator but not" is correct and usable in written English.
It can be used when distinguishing between roles or responsibilities, indicating that someone is an administrator in some contexts but not in others.
Example: "She is an administrator but not the one responsible for budget approvals."
Alternatives: "administrator excluding" or "administrator except for".
At their meeting, in February, Father Edwards told Bishop Dixon that he would recognize her as the diocese's administrator, but not as its sacramental leader.
He was a sober administrator but not a hero; a man who earned the respect of his contemporaries and posterity but was, perhaps, too cool, too aloof, and too faultless to obtain great sympathy.
But we consider it since it is useful in other scenarios (for instance, for intrusion detection or when some traffic is forbidden by a network administrator but not all nodes support filtering).
That may have made sense to teachers and administrators, but not to ambitious parents.
Mr. Reilly said he believed Paterno "died of a broken heart" because "after accomplishing so much" he had to wrestle at his career's end with allegations of sex abuse by an assistant coach and his own blunder in reporting the crimes to university administrators but not to the police.
Unlike Milwaukee, Detroit Public Schools' budget cut many things, from salaries to administrators, but not teachers.
As to the perceived costs and benefits of implementing the new system, the statement "I believe the hospital will save costs as a result of moving to the new system" was identified as statistically significant by nurses and administrators but not by doctors.
He was willing to describe his work as a Wikipedia administrator but would not identify himself other than by confirming the biographical details that appeared on his user page.
Correspondence obtained by HuffPost shows that supervisors at YSI were aware of the allegations involving the administrator but did not report them to the state.
According to The New Yorker, Essjay "was willing to describe his work as a Wikipedia administrator but would not identify himself other than by confirming the biographical details that appeared on his user page".
That may be true in Paris, students and college administrators said, but not necessarily in countries closer to Afghanistan and Pakistan.
