ELN stands for "Ejercito de Liberación Nacional", which is a Spanish phrase that translates to "National Liberation Army". There are several synonyms that can be used to refer to this term. One of the synonyms is "guerrilla group", which is a term commonly used to refer to armed resistance movements. Another synonym is "insurgent group", which refers to a group of fighters who are rebelling against an established authority. Other synonyms for ELN include "armed rebel group", "rebel fighters", "revolutionary group", "militant group", and "armed insurgents". These terms are often used interchangeably when referring to groups that engage in armed struggle against established governments.