Originally, an endgame tablebase was called an "endgame data base" or "endgame database". This name appeared in both EG and the ICCA Journal starting in the 1970s, and is sometimes used today. According to Haworth, the ICCA Journal first used the word "tablebase" in connection with chess endgames in 1995. According to that source, a tablebase contains a complete set of information, but a database might lack some information.
Haworth prefers the term "Endgame Table", and has used it in the articles he has authored. Roycroft has used the term "oracle database" throughout his magazine, EG. Nonetheless, the mainstream chess community has adopted "endgame tablebase" as the most common name.
Read more about this topic: Endgame Tablebase