category

mastery
UK /ˈkæ.tɪ.ɡə.ɹi/ US /ˈkæ.tɪˌɡɔ.ɹi/noun

card 1 of 10 · synonym

Which word is closest in meaning to 'category' in this sentence?

The traditional way of describing the similarities and differences between constituents is to say that they belong to categories of various types.