Johann Gutenberg vs Johannes Gutenberg

Johann Gutenberg and Johannes Gutenberg both are nouns.

Word	Noun	Adjective	Verb	Adverb
Johann Gutenberg	Yes	No	No	No
Johannes Gutenberg	Yes	No	No	No

As nouns, Johann Gutenberg and Johannes Gutenberg are synonyms defined as:

Johann Gutenberg and Johannes Gutenberg: German printer who was the first in Europe to print using movable type and the first to use a press (1400-1468)

Other synonyms of Johann Gutenberg include Gutenberg.

Johann Gutenberg (noun)	Johannes Gutenberg (noun)
German printer who was the first in Europe to print using movable type and the first to use a press (1400-1468)	German printer who was the first in Europe to print using movable type and the first to use a press (1400-1468)