Long Day's Journey into Night is considered to be Eugene O'Neill's magnum opus.
Source: tatoeba (7563137)
Ranked by relevance and common usage.
Keep "magnum" when the sentence already sounds natural, when a synonym would add unintended emphasis, or when readers need the most familiar wording. A synonym should clarify or sharpen the message, not simply make the sentence look more varied.
If two options seem close, choose the one that best matches the audience and purpose of the sentence.
Choose a synonym only if it keeps the core idea of "magnum" intact in the sentence you are editing.
Check whether the replacement sounds more formal, casual, emotional, technical, or forceful than the original word.
Read the full sentence after the swap. Keep the synonym only when the sentence becomes clearer or more precise.
Review note: Synonym lists are ranked with lexical data and reviewed for practical writing value. Use the comparison notes, sentence evidence, and source labels together; a high-ranking synonym can still be wrong when the audience, register, or grammar changes.
After choosing a replacement for "magnum", read the sentence once for meaning and once for rhythm. The best synonym should feel natural in the full sentence, not only accurate in a word list.
If the synonym makes the sentence slower, vaguer, or more dramatic than intended, keep "magnum" or choose a simpler alternative from the closest-match group.
OpenGloss and ConceptNet supply richer edges like generalizations, collocations, and derivations.
4 total sentences available.
Long Day's Journey into Night is considered to be Eugene O'Neill's magnum opus.
Source: tatoeba (7563137)
This is probably Tom's magnum opus.
Source: tatoeba (8504156)
So please don’t ask me when / There may be wine and roses / And magnums of champagne
Source: wiktionary
I know what you're thinking. "Did he fire six shots or only five?" Well, to tell you the truth, in all this excitement, I've kinda lost track myself. But, being as this is a .44 magnum, the most powerful handgun in the world, and would blow your head clean off, you've got to ask yourself one question: "Do I feel lucky?" Well, do ya, punk?
Source: wiktionary
Closest matches include bottle, canteen, cartridge, cruet, flask.
Compare the replacement against real sentence context. This entry includes sample sentences so you can check tone, grammar, and meaning before swapping words.