-ōsuffix. genitive (draft)
A prepositional suffix translated “from” (SD/429). In a few places, the suffix appears with the glide-consonant v (pronounced [w]) between it and a preceding u-vowel (SD/247, 249). It is likely related to the Quenya genitive inflection Q. -o.
* -akpreposition. away
A suffix in the word êphalak “far away”, a derivative of êphal “far” (SD/247). Some authors have suggested that -ak is an intensive suffix “very” instead of suffix meaning “away” (LGtAG, NBA/32). However, the corresponding Quenya word vahai(y)a “far away” is a combination va “(away) from” and haiya “far”, so it seems to me that the literal translation “away” is more likely to be correct (this translation of va was published after LGtAG and NBA were written).
* upronoun. he
A well-attested pronominal prefix, the masculine singular pronoun “he” (SD/433). See the entry on pronominal-prefixes for more discussion. Tolkien said that it had another variant hu- (SD/433), but this variant was only appears in the early and rejected hunekkū, which was changed to unekkū (see nakh-). Tolkien further indicated that the form u- primitively had an initial consonant [ɣ] or [ʔ] that was lost (SD/433).