troth

As a noun troth

is (archaic) an oath, promise, or pledge.

As an adjective wroth is

full of anger; wrathful.

As nouns the difference between tooth and troth

is that tooth is a hard, calcareous structure present in the mouth of many vertebrate animals, generally used for eating while troth is (archaic) an oath, promise, or pledge.

As a verb tooth

is to provide or furnish with teeth.

As nouns the difference between taxonomy and troth

is that taxonomy is the science or the technique used to make a classification while troth is (archaic) an oath, promise, or pledge.