Database Server & Database are one and the same. The confusion lies in that there are 2 releases of Oracle 9i - Release 1 is version 9.0 & Release 2 is version 9.2
So "Oracle9i Database Server Release 2, versions 9.2.0.4 and 9.2.0.5", put more simply, means "Oracle 9i versions 9.2.0.4 & 9.2.0.5".
Similarly, Oracle Database 9i and Oracle9i Database Server Release are the same product i.e. Oracle 9i