Opus and Quarto

Opus noun - A literary, musical, or artistic production.

Quarto and opus are semantically related In some cases you can use "Quarto" instead a noun "Opus".

Quarto noun - The size of a book whose pages are made by folding a sheet of paper twice to form four leaves.

Opus and quarto are semantically related in published document topic. Sometimes you can use "Opus" instead a noun "Quarto".