How to Say "entities" in Spanish
The Spanish word for “entities” is “seres” — B1 level. This is a very common word in everyday Spanish.

Examples
Los científicos estudian a los seres vivos que habitan este ecosistema.
Scientists study the living beings that inhabit this ecosystem.
Todos los seres humanos merecen respeto, sin importar su origen.
All human beings deserve respect, regardless of their origin.
La película trata sobre encuentros con seres de otro planeta.
The movie is about encounters with beings from another planet.
The Root Word 'Ser'
This word is the plural of 'ser' (meaning 'being' or 'creature', not the verb 'to be'). Although the noun 'ser' is masculine ('el ser'), it can refer to any creature, male or female.
Using 'Seres' vs. 'Personas'
Use 'seres humanos' when you want to emphasize the fundamental nature or existence of people; use 'personas' for general counts or social groups.
Mixing up the Noun and the Verb
Mistake: “Using 'seres' to mean 'you are' (which should be 'eres' or 'seas').”
Correction: 'Seres' is almost always the plural noun. The verb form 'seres' is extremely rare and archaic.
Related Translations
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