Old English hleahtor

← Proto-Germanic *hlahtraz (inherited)

← Old High German lahtar (cognate)

← Old Norse hlátr (cognate)

→ English laughter (inherited)

→ German Gelächter (cognate)

→ Middle English laughter (inherited)

→ Norwegian Bokmål lått (cognate)

→ Norwegian Nynorsk lått (cognate)