Deadly and Nocuous

Deadly adjective - Likely to cause or capable of causing death.

Nocuous and deadly are semantically related in deathly topic. In some cases you can use "Nocuous" instead an adjective "Deadly". literary substitute

Nearby Word: dead

Nocuous adjective - Causing or capable of causing harm.

Deadly and nocuous are semantically related in dangerous topic. You can use "Deadly" instead an adjective "Nocuous", if it concerns topics such as noxious.