Ketuvim vs Ketubim

Ketuvim and Ketubim both are nouns.

Word	Noun	Adjective	Verb	Adverb
Ketuvim	Yes	No	No	No
Ketubim	Yes	No	No	No

As nouns, Ketuvim and Ketubim are synonyms defined as:

Ketuvim and Ketubim: the third of three divisions of the Hebrew Scriptures

Other synonyms of Ketuvim include Hagiographa, Writings.

Ketuvim (noun)	Ketubim (noun)
the third of three divisions of the Hebrew Scriptures	the third of three divisions of the Hebrew Scriptures