parhaista
Parhaista is a Finnish inflection of the adjective paras, meaning best. It is the elative plural form, created with the suffix -ista, and is used to express origin from a group regarded as the best or to refer to the best ones within a larger set. It does not function as a standalone noun; its meaning is determined by the noun it modifies and the surrounding context.
In practice, parhaista appears with plural nouns in the elative case, as in phrases like parhaista kirjoista
Etymology and grammar: part of Finnish adjective inflection, derived from paras with the -ista elative plural