Swedish also has some important differences in grammar. Definite articles are suffixed onto the end of their nouns, so "ett hus" (a house) becomes "huset" (the house). Also unlike English, Swedish uses two grammatical genders called "Common" and "Neuter". Nouns of the Common gender are sometimes called "en words", and many words for living (or once-living) things are "en words". Nouns of the Neuter gender are sometimes called "ett words".