Word: nightmares
Part of speech: Noun
Syllables: night
mares
Definition: Plural of nightmare; a terrifying or deeply upsetting dream
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: -s
Language: en
PoS: Suffix
Meaning: Used to form regular plurals of nouns.