Yerba mate
Pronounced [YER-bah MAH-teh] (or [SHER-bah MAH-teh] in Rioplatense Spanish). Also known as Ilex paraguariensis, a holly plant natively grown in South America, particularly in Northern Argentina, Paraguay and Southern Brazil (the term erva mate is used there more often). Yerba mate is used to make a beverage known as mate in Spanish, or chimarrão in Portugese. Oftenly, the term yerba mate is used to describe not only a plant, but also a final product of grinding, drying and aging the plant.
Yerbera
Container for storing yerba mate, usually made of tin with a spout on top for pouring yerba mate into the gourd. Yerbera is used mainly as a more travel-friendly option for carrying yerba mate or as a long-term storage. Arguably keeps yerba mate fresh for longer periods of time.
Yuyos
Plural of yuyo. In Spanish, term yuyos is used to describe any kind of wild herbs used as a condiment for food or drink. Yuyos as a tereré condiment are very popular in Paraguay and are used as a flavor enhancement or for their medicinal properties.