Foremost
Part of speech: adjective
Definition: first, either in time or in space of a higher rank or position; paramount closest to the bow
Part of speech: adverb
Definition: in front prominently forward
Example sentence: Jeb Bush is the foremost authority on education reform in the Republican Party, and I will look to reform the ballooning costs of our higher education system along the lines that he has advocated.
Best
Part of speech: adjective
Definition: Most; largest.
Part of speech: adverb
Definition: (manner) Accurately, competently, satisfactorily.
Part of speech: verb
Definition: To beat in a contest.
Part of speech: noun
Definition: The supreme effort one can makeThe person (or persons) who is (are) most excellent.
Example sentence: Knowing your own darkness is the best method for dealing with the darknesses of other people.