Gearbox vs. Transmission?

Although it may not be "correct" I have always considered the marine gear or transmission to include both a clutch and reversing gear.

It can include reduction gears too ,tho many boats with a CPP setup will have only reduction gears , no clutch.

The prop is selected FWD , no thrust or REV as required.

In the UK we always say "gearbox" when referring to autos, unless talking about a "rare" automatic vehicle, when we will say it has "automatic transmission", although I left the UK 20 years ago, 99% of vehicles had "manual gearboxes", what you guys call "standard",
so it's really just the terminology, you use "trunk and hood" they use "boot and bonnet".

I've been in aviation all my life, I now work for Rolls-Royce building and repairing jet turbine engines, all of which have a "gearbox" attached!!!, hope that doesn't complicate matters even further lol.