Word: nightly
Part of speech: Adjective
Syllables: night
ly
Definition: Happening or appearing in the night; night-time; nocturnal.
Morphemes:
Affix: night
Language: en
PoS: Noun
Meaning: An evening or night spent at a particular activity.
Affix: -ly
Language: en
PoS: Suffix
Meaning: Used to form adjectives from nouns specifying time intervals, the adjectives having the sense of "occurring at such intervals".