Antibodies are protein molecules that recognizes specific epitope on an antigen(foreign particles)
White blood cells have many different classes, T, B, lymphocytes ect...
Antibodies are part of the immune system, and is produced by Bcells ect. While antibodies aid in recognition of foreign particles, viruses, bacterial ect, I wouldnt say that they actively fight. Its a Humoral response. While T-lymophocytes actually will engulf anything it doesnt like.
Cellular Immune Response
Cytotoxic T lymphocytes (killer T cells)
have receptors that recognize cells that display antigens on their surfaces; a series of reactions results in death of such cells
Helper T lymphocytes stimulate proliferation of appropriate B cells and killer T cells
Humoral Immune Response
B lymphocytes (B cells) ?
Plasma cells ?
Antibodies are secreted