drastic

As a noun taxonomy

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

As an adjective drastic is

extreme; severe.

is likely misspelled.

has no English definition.

As an adjective drastic

is extreme; severe.

As adjectives the difference between vehement and drastic

is that vehement is vehement while drastic is extreme; severe.

As adjectives the difference between drastic and rigorous

is that drastic is extreme; severe while rigorous is manifesting, exercising, or favoring rigour; allowing no abatement or mitigation; scrupulously accurate; exact; strict; severe; relentless; as, a rigorous officer of justice; a rigorous execution of law; a rigorous definition or demonstration.

As adjectives the difference between drastic and prodigious

is that drastic is extreme; severe while prodigious is very big in size or quantity; gigantic; colossal; huge.

As adjectives the difference between drastic and ultradrastic

is that drastic is extreme; severe while ultradrastic is extremely drastic.

As adjectives the difference between drastic and superdrastic

is that drastic is extreme; severe while superdrastic is very drastic.