newssheet vs newsletter

newssheet and newsletter both are nouns.

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

As nouns, newssheet and newsletter are synonyms defined as:

newssheet and newsletter: report or open letter giving informal or confidential news of interest to a special group

newssheet (noun)	newsletter (noun)
report or open letter giving informal or confidential news of interest to a special group	report or open letter giving informal or confidential news of interest to a special group