newgroup

As a proper noun usenet

is (internet) a world-wide distributed discussion system consisting of newsgroups classified hierarchically by subject.

As a verb newgroup is

(internet|transitive) to create (a newsgroup on usenet) by sending a special control message.

As verbs the difference between message and newgroup

is that message is to send a message to; to transmit a message to, e.g. as text via a cell phone while newgroup is to create (a newsgroup on Usenet) by sending a special control message.

As a noun message

is a communication, or what is communicated; any concept or information conveyed.

As verbs the difference between control and newgroup

is that control is to exercise influence over; to suggest or dictate the behavior of while newgroup is (internet|transitive) to create (a newsgroup on usenet) by sending a special control message.

As a noun control

is (countable|uncountable) influence or authority over.

As a noun newsgroup

is a repository on a computer network where people can post messages, usually about a single subject.

As a verb newgroup is

(internet|transitive) to create (a newsgroup on usenet) by sending a special control message.