General Synonyms:
* Combination
* Integration
* Amalgamation
* Fusion
* Composition
* Construction
* Creation
* Formation
* Assemblage
More Specific Synonyms:
* Conciliation (in the context of resolving differences)
* Harmonization (in the context of creating a unified whole)
* Comprehension (in the context of understanding)
* Deduction (in the context of logical reasoning)
* Formulation (in the context of creating a plan)
* Fabrication (in the context of manufacturing)
* Composition (in the context of art or music)
Example Sentences:
* The artist's synthesis of different styles created a unique and powerful work of art.
* The scientist's synthesis of the data led to a groundbreaking discovery.
* The peace talks were successful due to the combination of diplomacy and compromise.
The best synonym to use will depend on the specific context in which you are using the word "synthesis."