account vs newsletter

account and newsletter both are nouns.

Word	Noun	Adjective	Verb	Adverb
account	Yes	No	Yes	No
newsletter	Yes	No	No	No

As nouns, newsletter is a hyponym of account; that is, newsletter is a word with a more specific, narrower meaning than account:

account: a short account of the news
newsletter: report or open letter giving informal or confidential news of interest to a special group

Other hyponyms of account include newssheet, bulletin, communique, despatch, dispatch, urban legend, exclusive, scoop.

account (noun)	newsletter (noun)
the quality of taking advantage	report or open letter giving informal or confidential news of interest to a special group
importance or value
a record or narrative description of past events
an itemized statement of money owed for goods shipped or services rendered
a short account of the news
a statement that makes something comprehensible by describing the relevant structure or operation or circumstances etc.
the act of informing by verbal report
grounds
a statement of recent transactions and the resulting balance
a formal contractual relationship established to provide for regular banking or brokerage or business services

account (verb)	newsletter (verb)
furnish a justifying analysis or explanation
to give an account or representation of in words
keep an account of
be the sole or primary factor in the existence, acquisition, supply, or disposal of something