What is the best synonym for the word classification?

Answer 1

The adjective forms for the verb to classify are the present participle, classifying (a classifying factor), and the past participle, classified (a classified ad).

A related adjective form is classifiable.

Answer 2

Synonyms for the word classified are confidential, top-secret, private, and restricted. Some antonyms for classified are open, public, and unconcealed.

Answer 3

categorization, taxonomy

Answer 4

classifies