newsroom vs reading room

newsroom and reading room both are nouns.

Word	Noun	Adjective	Verb	Adverb
newsroom	Yes	No	No	No
reading room	Yes	No	No	No

As nouns, reading room is a hypernym of newsroom; that is, reading room is a word with a broader meaning than newsroom:

newsroom: a reading room (in a library or club) where newspapers and other periodicals can be read
reading room: a room set aside for reading

newsroom (noun)	reading room (noun)
a reading room (in a library or club) where newspapers and other periodicals can be read	a room set aside for reading
an office in which news is processed by a newspaper or news agency or television or radio station
the staff of a newspaper or the news department of a periodical