Immunogen and Vaccinum

Immunogen noun - Any substance or organism that provokes an immune response (produces immunity) when introduced into the body.

Vaccinum and immunogen are semantically related. In some cases you can replace term "Vaccinum" with "Immunogen", this nouns are similar.

Vaccinum noun - Immunogen consisting of a suspension of weakened or dead pathogenic cells injected in order to stimulate the production of antibodies.

Immunogen and vaccinum are semantically related. You can use "Immunogen" instead a noun "Vaccinum".