General terms:
* Entities: This is a broad term that encompasses all things that exist, including persons, places, things, and ideas.
* Referents: This term is often used in linguistics to describe the actual person, place, thing, or idea that a word or phrase refers to.
More specific terms:
* Individuals: For specific persons.
* Locations: For specific places.
* Objects: For specific things.
* Concepts: For specific ideas.
Other options:
* Specimens: For specific examples of something.
* Instances: For specific occurrences of something.
* Particulars: For specific details.
Ultimately, the best word to use will depend on the specific context and the nuance you are trying to convey.