Antigen and Ragweed

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

Ragweed and antigen are semantically related in irritant topic. In some cases you can use "Ragweed" instead a noun "Antigen".

Ragweed noun - Any of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthma.

Antigen and ragweed are semantically related in irritant topic. You can use "Antigen" instead a noun "Ragweed".