An Epic
Epic, Epic Saga, Masterpiece, Masterwork, Magnum Opus
noun
The big make! What is your big make? Bigger than anything else. It is your epic (as in an epic that you write). Also could be an epic, epic saga, and masterpiece.
たいさく
This is a jukugo word, which usually means on'yomi readings from the kanji. Since 大 has two on'yomi readings, here's a mnemonic to help you remember which one to use:
Did you know that there's an epic about a tie sack (たいさく)? It's a masterpiece about a magic sack that produces tie after tie after tie. A bit like The Magic Porridge Pot, but with a sack and ties instead.
このえいがは、ヒッチコックの大作だ。
This movie is a Hitchcock epic.
今世き一ばんの大作ともいわれているえいがのタイトルは「フグの一生」です。
The title of the most epic film this century is said to be, "A Life of Fugu."
ベートーベンが作曲した曲は、どれも大作だった。
Every score that Beethoven wrote was a masterpiece.