Saturday vs Sabbatum

Saturday and Sabbatum both are nouns.

Word	Noun	Adjective	Verb	Adverb
Saturday	Yes	No	No	No
Sabbatum	Yes	No	No	No

As nouns, Saturday and Sabbatum are synonyms defined as:

Saturday and Sabbatum: the seventh and last day of the week; observed as the Sabbath by Jews and some Christians

Other synonyms of Saturday include Sat.

Saturday (noun)	Sabbatum (noun)
the seventh and last day of the week; observed as the Sabbath by Jews and some Christians	the seventh and last day of the week; observed as the Sabbath by Jews and some Christians