Cougar is a slang term that refers to a woman who seeks sexual relations with considerably younger men.
zona - (anatomy) any encircling or beltlike structure zone anatomical structure, bodily structure, body structure, complex body part, structure - a particular complex anatomical part of a living thing; he has good bone structure
Zena is also a diminutive form of the name Zenobia (English, Italian, Polish, and Romanian). Zena is also a variant of the name Zina (Czech, English, Greek, and Russian). See also the related form, the English Zona. Zena is unusual as a baby girl name. Its usage peaked modestly in 1964 with 0.011% of baby girls being given the name Zena.