[gdl]

Corruption of the English language aside, chamomile or mint infusions are no more "teas" than they are "coffees". They're all just plant stuff steeped in water, but the flavors and cultures involved vary dramatically.

I'm normally pretty liberal about language but it bugs me to have to specify a latin species name, or "tea made from tea" to make it clear what I'm drinking. Although phrases like "green tea" or "black tea" are widely-understood and fairly unambiguous in situations where one can be more specific, there isn't a good way to refer to the entire class of beverages made from only that plant.