Gearshift and Reducer

Gearshift noun - A mechanical device for engaging and disengaging gears.

Reducer and gearshift are semantically related in gear box topic. In some cases you can use "Reducer" instead a noun "Gearshift".

Reducer noun - A substance capable of bringing about the reduction of another substance as it itself is oxidized; used in photography to lessen the density of a negative or print by oxidizing some of the loose silver.

Gearshift and reducer are semantically related in gear box topic. You can use "Gearshift" instead a noun "Reducer".