Antigen and Toxoid

Antigen noun - Any substance (as a toxin or enzyme) that stimulates an immune response in the body (especially the production of antibodies).

Toxoid and antigen are semantically related. In some cases you can replace term "Toxoid" with "Antigen", this nouns are similar.

Toxoid noun - A bacterial toxin that has been weakened until it is no longer toxic but is strong enough to induce the formation of antibodies and immunity to the specific disease caused by the toxin.

Antigen and toxoid are semantically related. Sometimes you can use "Antigen" instead a noun "Toxoid".