hotheaded

As a noun taxonomy

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

As an adjective hotheaded is

pertaining to or characteristic of a hothead or hotheadedness; (of a person) easily excited or angered.

Coolheaded is a antonym of hotheaded.

As adjectives the difference between hotheaded and coolheaded

is that hotheaded is pertaining to or characteristic of a hothead or hotheadedness; (of a person) easily excited or angered while coolheaded is having an even temper; calm and collected.