Protest
Part of speech: verb
Definition: to make a strong objection to affirm something to object to.
Part of speech: noun
Definition: A formal objection, especially one by a group A collective gesture of disapproval, sometimes violent
Example sentence: We of Africa protest that, in this day and age, we should continue to be treated as lesser human beings than other races.
Protestation
Part of speech: noun
Definition: a formal solemn objection or other declaration