Words that come from Proto-Indo-European “mor-”

32 words across 16 languages descend from Proto-Indo-European mor- — including nightmare, nightmarish, mara, nightmarishly, nightmarelike, nightmarishness, mor-, mare.

See the etymology of mor- itself →

English (10)

Finnish (3)

Danish (2)

Norwegian Bokmål (2)

Norwegian Nynorsk (2)

Old English (2)

Proto-West Germanic (2)

Proto-Indo-European (1)

Middle Dutch (1)

Old Dutch (1)

Swedish (1)

Albanian (1)

Old Norse (1)

Proto-Germanic (1)

Proto-Albanian (1)

Middle English (1)