Are you implying that Congress isn't part of the Spanish government?
In fact the word govern implies executive.
I'm curious now what Europeans call them.
Separation of powers:
- Legislative (parliament, congress, senate, house of ..., many names - in Spain I think they call it Cortes Generales and it consists of two chambers, a senate and a congress)
- Executive (government)
- Judicial (courts)
The US Government is split into three branches, like you mentioned (Legislative, Executive, Judicial). Those three branches are the government. You are erroneously equating government to mean exclusively the executive branch of the government though.