For those interested in learning Latin viva voce, not only so they can speak it, but so they can learn how to 'think in Latin', and so read more fluently.
As far as Greek is concerned, you can use:
G. Cauquil - J. Y. Guillaumin, Vocabulaire de base du Grec (alphabétique, fréquentiel, étymologique), A.R.E.L.A.B., Besançon, 1985; J. Van Baeveghem - L. De Vuyst, Katalogos (Grieks Basisvocabularium), U...
This list could probably be useful:
P.B. Diederich, The frequency of Latin words and their endings, The University of Chicago Press, Chicago, Illinois, 1939; G. Lodge, The vocabulary of high school Latin, Teachers Coll., New York, 1907; L. Delatt...