[2] In 1914, he was selected as an editor for the Historical Dictionary of the Greek Language (Ἰστορικὸν Λεξικὸν τῆς Ἑλληνικῆς Γλώσσης), a position he held until 1924, when he became director of the project.
[3] Amantos published several studies on linguistic issues, particularly of the dialect of his native Chios, as well as the historical geography of the Greek world.
This work covered the history of Byzantium from the division of the Roman Empire in 395 until the fall of Constantinople to the Fourth Crusade in 1204.
[7] Amantos also published important studies on the Greeks of Asia Minor in the Middle Ages (Ὁ Ἑλληνισμός τῆς Μικράς Ἀσίας κατὰ τον μεσαίωνα, 1919), the South Slavs, Bulgarians, and Albanians (Οἱ βόρειοι γείτονες τῆς Ἑλλάδος (Βούλγαροι - Ἀλβανοί - Νοτιοσλάβοι), 1923), and a number of articles focusing particularly on the history of Slavs in Greece and the relations of the Greeks with the Serbs, Bulgarians, and Turks.
[7] He extended his attention to the Ottoman era as well, with studies on Rigas Feraios, the Phanariote official Alexandros Mavrokordatos, the Chiot Renaissance scholar Leo Allatius, and Adamantios Korais.