Your pixelated problem prolly in'nt the printer at all:
An inkjet (any inkjet) does not raster-image-process (RIP) the image like a Postscript laser printer does. Inkjets just print whatever the Mac streams to it. Therefore, all high-res font rendition must be done in the program or in the print driver before its sent out the cable.
You dont say what the OS you are using is, the machine, or the particular fonts that are pixelated, so it's hard to say specifically what the solution is to your problem.
At a guess Word is working because you are using TrueType fonts in Word, which the OS renders into high res automatically, and the Adobe programs are not because you are using Postscript fonts in them and there is some issue.
Likely your font installation is not correct, such as you have screen versions of Postscript fonts with no Postscript downloadable fonts in the same folder.
And/or the Epson print driver or the Adobe software is not properly installed.
Open a document, choose one of your troublesome fonts (a font other than the ones that came with the Mac and with Office), then set the font to an oddball size, like 43. Zoom in. Does it look pixelated on screen? If so, the font is not scaling/rendering in high res and it's your font installation that's h00ped.
They'll look OK at 72 dpi screen resolution in 10 12 and 14 point because the screen font usually covers those sizes. But on paper 72 dpi is noticeably blocky.
Fix your fonts and fix your software first before concluding the printer is no good.
Thanks
Trevor
CanadaRAM
G4 1.25DP and Epson 2200