1 Samuel vs I Samuel

1 Samuel and I Samuel both are nouns.

Word	Noun	Adjective	Verb	Adverb
1 Samuel	Yes	No	No	No
I Samuel	Yes	No	No	No

As nouns, 1 Samuel and I Samuel are synonyms defined as:

1 Samuel and I Samuel: the first of two books in the Old Testament that tell of Saul and David

1 Samuel (noun)	I Samuel (noun)
the first of two books in the Old Testament that tell of Saul and David	the first of two books in the Old Testament that tell of Saul and David