Το λεξιλόγιο αποτελεί παραλλαγή του λεξιλογίου «Θεματικές Επιστημονικών Πεδίων ΕΚΤ», ειδικά διαμορφωμένη για την κατηγοριοποίηση των τεκμηρίων του OpenArchives.gr
isi - Linguistics covers resources relating to all theoretical and applied aspects of linguistics, including phonetics, phonology, morphology, syntax, and semantics. The category also includes resources dealing with language as a social phenomenon such as sociolinguistics, language acquisition and education, psycholinguistics, computational linguistics, corpus linguistics, semiotics and the relationship between memory and language.
isi - Language & Linguistics covers resources relating to theoretical, literary and historical linguistics as well as stylistics and philology.