I don't think this exists, unless you consider a LabVIEW program with an embedded (ActiveX) WORD file as a "word processor written in LabVIEW".
LabVIEW can be used for many things, but for a word-processor with custom fonts and sounds.... Try looking for examples in VisualBasic, maybe you'll have more luck there.
Hope this helps
Shane.
Using LV 6.1 and 8.2.1 on W2k (SP4) and WXP (SP2)