Word: nightmarish
Part of speech: Adjective
Syllables: night
mar
ish
Definition: Resembling a nightmare.
Morphemes:
Affix: night
Language: en
PoS: Noun
Meaning: Darkness (due to it being nighttime).
Affix: mare
Language: en
Meaning: evil spirit believed to afflict a sleeping person
Affix: -ish
Language: en
PoS: Suffix
Meaning: Typical of, similar to, being like.