This is the 591st most frequent Greek word.
έλληνας
"Έλληνας" means "Greek" (a male person from Greece).
Here, 'Έλληνας' is used as a noun indicating nationality, describing the person Yannis as Greek.
Ο Γιάννης είναι Έλληνας.
Yannis is Greek.
In this sentence, 'Έλληνας' functions as an adjective, modifying the noun 'philosopher' to specify their nationality or cultural background.
Έλληνας φιλόσοφος έγραψε αυτό το έργο.
A Greek philosopher wrote this work.
Here, 'Έλληνες' is the plural form of the noun, referring to the people of Greece collectively.