English soporific

← English stupor (mention)

← French soporifique (derived)

← Proto-Indo-European *swepōr (derived)

← Proto-Indo-European *swep- (mention)

← Latin sopor (derived)

→ English soper (mention)

→ English soporifically (suffix)

→ English nonsoporific (prefix)

→ Polish spać (mention)

→ Russian спать (mention)