WordNet: closed-class word, function word

a word that is uninflected and serves a grammatical function but has little identifiable meaning

• hypernym word

• hyponym determinative, determiner

• hyponym preposition

• hyponym pronoun

• hyponym conjunction, conjunctive, connective, continuative

• hyponym particle

closed-class word

• (suomi) suljettu sanaluokka (synonyymi; <unconfirmed/>)

function word

• (suomi) funktiosana (synonyymi)