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賑やか [にぎやか]

bustling/busy (adjectival nouns or quasi-adjectives (keiyodoshi))

賑やかさ [にぎやかさ]

business/liveliness (noun (common) (futsuumeishi))

賑やかす [にぎやかす]

to make lively/to make exciting (Godan verb with `su' ending, transitive verb)