Columbia subject headings:
Grammar, Comparative and general--Agent nouns.
Proto-Slavic language--Noun.
Proto-Slavic language--Suffixes and prefixes.
Harvard subject headings:
Grammar, Comparative and general--Agent nouns.
Proto-Slavic language--Noun.
Proto-Slavic language--Suffixes and prefixes.
Princeton subject headings:
Proto-Slavic language--Noun.