twistedsymphony, check your PMs.
Compare 0A5A0168 in Naomi bin to 000E88C0 in JP WORD.AFS for example for a string match. It looks like there is also some kind of data before each string, which may just be from the AFS file structure, or may be used for formatting text on screen.
Table of contents locations (there is a list of BIN files, which seem to make up the AFS file and may refer to certain dialogue lines, or may be random)
0A40B000 - Naomi BIN
001A1000 - JP WORD.AFS
001D3000 - US WORD.AFS
It looks like there are more strings in the English version than the JP version, so a straight replacement of the full WORD.AFS file probably won't work. The BIN files are named differently across the JP/ENG versions too. In fact, the dictionary area of the Naomi binary does not start with "AFS" like the WORD.AFS files do.
I guess a starting point would be to replace strings from the US WORD.AFS directly into the Naomi BIN once you've determined the location of a desired string by cross referencing the JP WORD.AFS.
Most text is prepended by 'FFFFFFFF0000000000000000', so that should help you in determining the locations of strings.