Newssheet, written that way, is listed in the online Merriam-Webster and Wiktionary. The other online dictionaries tend to hyphenate it.
In terms of actual usage, the News on the Web corpus has more examples of
news-sheet than
newssheet, and even more of the two-word form
news sheet.
M-W defines it as simply another word for
newspaper or
newsletter, which seems too broad. The Collins online dictionary is more specific in defining its (hyphenated) version:
A news-sheet is a small newspaper that is usually printed and distributed in small quantities by a local political or social organization.
A usage example is from a 2019
Irish Times article about Maud Gonne, the "Irish Joan of Arc":
Gonne also established the Women’s Prisoners’ Defence League, publishing a monthly newssheet under the pseudonym "a woman of no importance"...
Newssheet will be accepted as a rare word.
I'll respond to
hotshoe another time.