The big difference between those two services and the web was that most participants used text-only software (in terminals) to access them. Actually an even bigger difference is that (like all the other services on the internet back then) net news and IRC were run by volunteers.
The average IQ on the internet back then was more than 130 (whereas of course today it is in the range of 102 to 105) -- and it was 98% or 99% men and much more libertarian than today. One thing that hasn't changed is that people back then tended to spent much more time on the internet (particularly, on the newsgroups, IRC, text-only MMORPGs) than is good for them.
It was always called the newsgroups or "net news": calling it Usenet was started by the news industry when they started explaining the internet to the world in 1993 and 1994 because obviously "net news" is a horrible name (in their minds) for any service or scene that they did not control.
More precisely, the newsgroups began on what is basically a "competitor" to the internet called Usenet, then migrated to the internet, so "Usenet news", i.e., that news-like service that started on Usenet, is not a terrible name for it, but "Usenet" by itself is kind of a bad name because it already meant something different, namely, this network (now probably long gone) that carried email and other services in addition to newsgroups.