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Hollows are not the opposite of a Shinigami.
There are two types of ghosts: Plus and Hollow. Shinigami are the gods of ghosts, they send the Pluses to Soul Society and cleanse the Hollows.
Arrancar are Hollow that became Shinigami.
Visored are Shinigami that became Hollow.
Hougyouku only makes shinigami out of Hollows (and other special-powered Hollows).
It does not make Hollows out of Shinigami, as far as I understood Aizen. That process is mostly "natural", it happens by itself.
Menos Grande, Gillian, Ajucas and Vastrode are a type of Hollow.
So far this is all Kubo has told us.
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