A gonad, sex gland, or reproductive gland is a mixed gland that produces the gametes (sex cells) and sex hormones of an organism. In the female of the species the reproductive cells are the egg cells, and in the male the reproductive cells are the sperm. ... The female gonad, the ovary, produces egg cells.
Gamate is a mature haploid male or female germ cell which is able to unite with another of the opposite sex in sexual reproduction to form a zygote.
A sperm is a cell which is produced in the sex organs of a male animal and can enter a female animal's egg and fertilize it.