fa faaaa, faa-aa

faa,  s. a valley; a low place among the hills. [Dav : 1717] (note)
faa,  a causative prefix, common to most if not all the Polynesian dialects; in the Tahitian it is faa or haa, and in some instances ta; but in other dialects faka, haka, aku, and hoo. It is prefixed to nouns, adjectives, and verbs neuter, by means of which they are turned into verbs active. [Dav : 1718] (note)
faá,  s. vallée. - Devant un mot, équivaut aux verbes faire, causer, nommer. [Jau :568] (note)