rotter

As an adjective rotten

is of perishable items, overridden with bacteria and other infectious agents.

As an adverb rotten

is to an extreme degree.

As a noun rotter is

a worthless, despicable person.

As nouns the difference between otter and rotter

is that otter is any aquatic or marine carnivorous mammal, member of the family Mustelidae, which also includes weasels, polecats, badgers, and others while rotter is a worthless, despicable person.

As a proper noun Otter

is a river whose source in the Blackdown Hills, Somerset, and which flows into Lyme Bay in English Channel.

As nouns the difference between router and rotter

is that router is someone who routes or directs items from one location to another while rotter is a worthless, despicable person.

As a verb router

is to hollow out or cut using a router power tool.

As nouns the difference between taxonomy and rotter

is that taxonomy is the science or the technique used to make a classification while rotter is (rot).