Newsreader is a initialism of nntp.

In computing|lang=en terms the difference between newsreader and nntp

is that newsreader is (computing) a program for reading and posting to newsgroups while nntp is (computing) , a standard mechanism for transferring messages between a server and a newsreader program.

As a noun newsreader

is an anchorman in a news program, a news anchor, newscaster.

As an initialism nntp is

(computing) , a standard mechanism for transferring messages between a server and a newsreader program.