An information sheet or bulletin, or a report circulated periodically to a special interest group.
Bulletin, digest, newssheet, communication
Newsletter, one word.
In French it is the same word NEWSLETTER.
The Sanskrit word for newsletter is "वार्तापत्रम्" (vārtāpatram).
newsletter is a compound word
Newsletter is usually written as a single word.
An information sheet is another word for the word newsletter. Other words that mean the same as a newsletter are bulletin and circular.
'Newsletter' in Japanese isニュースレター (nyuusuretaa).
synonymize
word for word
One such word is bulletin.
The antonym of the word 'synonym' is 'antonym'.