Nontoxic and Risk-free

Nontoxic adjective - Not producing or resulting from poison.

Risk-free and nontoxic are semantically related in not dangerous topic. In some cases you can use "Risk-free" instead an adjective "Nontoxic".

Risk-free adjective - Thought to be devoid of risk.

Nontoxic and risk-free are semantically related in not dangerous topic. Sometimes you can use "Nontoxic" instead an adjective phrase "Risk-free".