| marker(stone, remembrance, shrine, memorial, testimonial) | |
| mausoleum(stone, remembrance, shrine, memorial, testimonial) | |
| minor(profession, major, hobby) | |
| monolith(stone, remembrance, shrine, memorial, testimonial) | |
| monument(noun, classic, remembrance, shrine, memorial) | |
| notebook | |
| novel | |
| number(profession, major, hobby) | |
| obelisk(stone, remembrance, shrine, memorial, testimonial) | |
| object of attention(expression, idiom, profession, major, hobby) | |
| object of study(expression, idiom, profession, major, hobby) | |
| occupation(profession, major, hobby) | |
| oeuvre | |
| outstanding accomplishment | |
| paperback | |
| piece(noun, work, invention, handiwork, concoction) | |
| pile(shrine, memorial, testimonial) | |
| pillar(stone, remembrance, shrine, memorial, testimonial) | |
| playbook | |
| practice(profession, major, hobby) |
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| APA | Smart Define. (2015). magnum opus thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/magnum_opus/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "magnum opus thesaurus" https://smartdefine.org/magnum_opus/thesaurus/synonyms (accessed September 30, 2026). |
| Harvard | Smart Define 2015, magnum opus thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/magnum_opus/thesaurus/synonyms>. |
| MLA | Smart Define. "magnum opus thesaurus" 10 April 2015. Web. 30 September 2026. <https://smartdefine.org/magnum_opus/thesaurus/synonyms> |