The command for the KOffice word processor is kword. Try Alt-F2 and
type kword or kspread or kexi or kpresenter or korganizer or kontact
or krita or kaddressbook, etc. I do not have GNOME Office installed,
but imagine it is similar. If you know the application you can
probably guess. Remember no spaces and probably lowercase only.

If none launch then you have a bigger problem and need to find why it
is not installing.You can edit the menu in classic GNOME so if they
launch you can add a launcher to the menu. I think that if you right
click on the menu you can edit it. I am in KDE now and that is the way
it work there. Or you could just use KDE where everything just works.