Old Norse þrǫstr

← Proto-Germanic *þrastuz (inherited)

← Proto-Indo-European *trosdos (derived)

→ English thrush (cognate)

→ Faroese trøstur (derived)

→ Icelandic þröstur (inherited)

→ Norwegian Bokmål trost (derived)

→ Norwegian Nynorsk trost (derived)

→ Swedish trast (inherited)