Online Thesaurus:
* Merriam-Webster Thesaurus: [https://www.merriam-webster.com/thesaurus/monograph](https://www.merriam-webster.com/thesaurus/monograph)
* Dictionary.com Thesaurus: [https://www.dictionary.com/browse/monograph](https://www.dictionary.com/browse/monograph)
* Thesaurus.com: [https://www.thesaurus.com/browse/monograph](https://www.thesaurus.com/browse/monograph)
* Power Thesaurus: [https://www.powerthesaurus.org/monograph](https://www.powerthesaurus.org/monograph)
Other Resources:
* Oxford English Dictionary: The Oxford English Dictionary is a great resource for finding synonyms, but it does require a subscription.
* Roget's Thesaurus: This classic thesaurus is available in print and online.
* Your preferred dictionary: Many dictionaries include a thesaurus section.
Keep in Mind:
* Synonyms are not always perfect replacements. The best synonym for "monograph" will depend on the specific context in which you are using it.
* Some synonyms may be more formal or informal than others.
* Consider the intended audience and the tone of your writing when choosing a synonym.
Example Synonyms for "Monograph":
* Academic treatise
* Dissertation
* Scholarly work
* Research paper
* Study
* Dissertation
* Treatise
* Essay
* Dissertation
* Volume
* Book
I hope this helps!