We do not currently know of any antonyms for specificker.
The noun specificker is defined as:
A homoeopathic practitioner who sought to ascertain the aetiologies of diseases, focusing on the symptoms most regularly associated with their diagnosis (to the exclusion of peripheral and occasional symptoms), and who, for their treatment, selected remedies (administered in more-or-less undiluted form) on the basis of their general physiological effects, ignoring incidental and side-effects. [mid- to late-19th c., first attested in 1847 and common in the 1860s.]