Formal/Neutral:
* Slavers: This term specifically refers to those who engaged in the trade of slaves.
* Masters: This term is more general and can refer to any owner of slaves, but it's important to be aware of its potentially romanticized connotations.
* Enslavers: This term emphasizes the act of enslaving, highlighting the violence and oppression involved.
* Owners of enslaved people: This is a more precise and less emotionally charged phrase.
Informal/Negative:
* Oppressors: This term focuses on the power imbalance and abuse inherent in slavery.
* Exploiters: This term emphasizes the economic and social benefits slave owners gained from exploiting enslaved people.
* Tyrants: This term emphasizes the cruelty and brutality associated with slavery.
The best word to use will depend on the specific context and the message you want to convey.
It's also important to remember that "slave owners" is a loaded term with a long history of injustice and brutality. It's crucial to use language that accurately reflects the reality of slavery and the suffering it caused.