tranch

As a noun taxonomy

is the science or the technique used to make a classification.

As a verb tranch is

to slice a sturgeon.

As verbs the difference between trench and tranch

is that trench is to invade, especially with regard to the rights or the exclusive authority of another; to encroach while tranch is to slice a sturgeon.

As a noun trench

is a long, narrow ditch or hole dug in the ground.