Umm...there isnt really a new part of speech...
There are only eight and they are:
the verb
the noun
the pronoun
the adjective
the adverb
the preposition
the conjunction
and the interjection
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The word news is a uncountable, aggregate, abstract, common noun, a word for reports of currently-occurring events.
It can be a noun adjunct used with other nouns as in news broadcast or news channel.
New is an adjective.