Word: nightfuls
Part of speech: Noun
Syllables: night
fuls
Definition: Plural of nightful. Pertaining to the night; occuring at night, found at night, resulting from the night, night-like, etc.
Morphemes:
Affix: night
Language: en
PoS: Noun
Meaning: Darkness (due to it being nighttime).
Affix: -ful
Language: en
PoS: Suffix
Meaning: Used to form adjectives from nouns. Full of, tending to, or thoroughly possessing the quality expressed by the noun.
Affix: -s
Language: en
PoS: Suffix
Meaning: Used to form many pluralia tantum (nouns that are almost or entirely without singular forms).