Antibody and Immune serum globulin

Antibody noun - Any of a large variety of proteins normally present in the body or produced in response to an antigen which it neutralizes, thus producing an immune response.

Immune serum globulin and antibody are semantically related. In some cases you can replace phrase "Immune serum globulin" with "Antibody", this terms are similar.

Immune serum globulin noun - A class of proteins produced in lymph tissue in vertebrates and that function as antibodies in the immune response.

Antibody and immune serum globulin are semantically related. You can use "Antibody" instead a noun phrase "Immune serum globulin".