Asseverate and Avouch

Asseverate verb - State categorically.

Avouch and asseverate are semantically related in declare topic. In some cases you can use "Avouch" instead a verb "Asseverate", when it comes to topics like affirm.

Avouch verb - To declare (something) to be true or genuine.

Asseverate and avouch are semantically related in assert topic. You can use "Asseverate" instead a verb "Avouch", if it concerns topics such as affirm, vouch for.