Roman Jakobson vs Jakobson

Roman Jakobson and Jakobson both are nouns.

Word	Noun	Adjective	Verb	Adverb
Roman Jakobson	Yes	No	No	No
Jakobson	Yes	No	No	No

As nouns, Roman Jakobson and Jakobson are synonyms defined as:

Roman Jakobson and Jakobson: United States linguist (born in Russia) noted for his description of the universals of phonology (1896-1982)

Other synonyms of Roman Jakobson include Roman Osipovich Jakobson.

Roman Jakobson (noun)	Jakobson (noun)
United States linguist (born in Russia) noted for his description of the universals of phonology (1896-1982)	United States linguist (born in Russia) noted for his description of the universals of phonology (1896-1982)