word vba and excel vba are similar in that they are both based on vb, but different in that each is somewhat unique to its own environment.
The object oriented syntax is fundamentally the same, but their methods and properties are different.
for example, to do a 'find' in word, you can use:
yourobject.find.execute find:="whatever"
to do a find in excel, you can use:
yourobject.cell.find what:="whatever"
fumei is right. in general you can accomplish what you want using either word or excel.
If you're having problems with word vba, try using doing a search on its help files (or wizard) for the particular action you wish to accomplish. Do keyword searches for individual actions as opposed to entering entire phrases or asking 'how do i' questions. Then read up on each particular method, function or property to see if it fits in line with the concept of what you wanna do. This has worked very well for me is how i learned word vba.
Of course, I think excel vba is easier, but that's just my opinion and I've been working with it a bit longer.
Peace!
*****Tyhand