Eminent describes someone famous and respected, especially within a particular profession, as in an eminent historian. Prominent can mean the same thing, well known and respected, but it also covers something that simply stands out because of its size or position. If it's only about standing out visually, use prominent, not eminent.
The core difference
Eminent is reserved for people respected within their field; prominent covers both respected people and physically noticeable things.
- eminent — famous and respected, especially in a profession: An eminent historian was invited to give the keynote speech.
- prominent — well known and respected, or easily noticeable because of size or position: The building's prominent glass tower can be seen from across the city.
How to tell them apart
Both words trace back to Latin roots meaning to stand out or project, which is why their meanings overlap so much when it comes to describing well-respected people. An eminent scientist and a prominent scientist are both highly regarded, and in that sense the words are close to interchangeable.
The difference shows up with objects and features rather than people. A prominent glass tower or a prominent nose is simply noticeable because of its size or position, with no sense of being respected. Eminent doesn't stretch to cover physical objects in that way, so it stays reserved for people and their standing.