Its pretty self-explanitory. Androgens cause secondary sex characteristics AND also help build muscle and strength (to a lesser degree of anabolics). Therefore you want some degree of androgen in your drug, but NOT TOO MUCH or you may get unwanted side effects...

an´dro-jen) any steroid hormone that promotes male characteristics. The two main androgens are androsterone and testosterone. adj., androgen´ic.
The androgenic hormones are internal endocrine secretions circulating in the bloodstream and manufactured mainly by the testes under stimulation from the "pituitary gland" PITUITARY GLAND. To a lesser extent, androgens are produced by the adrenal glands in both sexes, as well as by the ovaries in women. Thus women normally have a small percentage of male hormones, in the same way that men's bodies contain some female sex hormones, the estrogens.
The androgens are responsible for the secondary sex characteristics, such as the beard and the deepening of the voice at puberty. They also stimulate the growth of muscle and bones throughout the body and thus account in part for the greater strength and size of men as compared to women.

anabolics are easily defined as having no androgenic qualities and only help to promote growth and allow quick recovery

any of a group of synthetic derivatives of testosterone, having pronounced anabolic properties and relatively weak androgenic properties, which are used clinically mainly to promote growth and repair of body tissues in senility, debilitating illness, and convalescence