"nightlifes" in the noun sense
1. nightlife, night life
the entertainment available to people seeking nighttime diversion
"a futile search for intelligent nightlife"
2. nightlife, night life
the activity of people seeking nighttime diversion (as at the theater, a nightclub, etc.
"in the summer the nightlife shifts to the dance clubs"
Source: WordNet® (An amazing lexical database of English)
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