In the US, the terminology tends to split into "fired" (implies "for valid reasons") vs "laid off" (implies "position was terminsted, this was not about the employee or their qualities and performance").

In the UK "fired" would mean the same, "laid off" off would mean the same, "made redundant" also means the same and more clearly, with emphasis on the position no longer existing. "Sacked" means about the same as fired.