untie

As a noun taxonomy

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

As a verb untie is

to loosen, as something interlaced or knotted; to disengage the parts of.

As verbs the difference between untie and untruss

is that untie is to loosen, as something interlaced or knotted; to disengage the parts of while untruss is to free from a truss; to untie or unfasten.

As a noun untruss is

(obsolete) an untrusser or public whipper.