opus
US /ˈoʊ.pəs/
UK /ˈoʊ.pəs/

1.
a separate composition or set of compositions by a particular composer, usually numbered in order of publication
:
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Beethoven's Symphony No. 5 is one of his most famous opus.
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The composer's latest opus received critical acclaim.
2.
a large-scale work of art, literature, or music
:
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The novel was considered his greatest opus.
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The director's new film is a cinematic opus.