I think that one of the reasons communicators get so frustrated with electronic options like websites and social media is because of all the lingo involved. String more than one acronym together and it gets hard to parse it all out.
So, I really appreciated this post from the folks at Nielsen Norman Group that explains the difference between website information architecture (IA) and navigation. There’s the one sentence summary:
IA is the information backbone of the site; navigation refers to those elements in the UI that allow users to reach specific information on the site.
And then there is more. Hope this helps.