Plain coffee or tea VS black coffee or tea

Question

A coffee drink with no additives- no sugar no cream or no milk is called "black coffee". Can it be also called "plain coffee?"

If yes, then can these callings be carried over to tea? That is to say, can we call "just the tea" without milk/ sweetner as plain tea or black tea?

But, as far as tea is concerned, what I hear is that unlike the case of coffee, black tea is a far cry from (plain) tea; it is a special brew.

Clarification will be very helpful indeed.

Answer 1

A few points:

• Black tea can be sweetened or not.
• Black tea means tea made from black leaves, not tea with no milk.
• Sweet tea means something different than tea with sugar.
• Unsweetened tea means something different than tea without sugar.

I caused undue confusion in my youth asking for a plain coffee before I learned to simply say:

• Coffee, no milk or sugar.
• [Some type of] tea, no milk or sugar.

Answer 2

can it be ALSO called "PLAIN COFEE?"

No. To me that would mean an "ordinary" coffee, i.e. one without any unusual additives*, a phrase that is not helpful.

If yes

The answer is "No", so there is no need to address this part.

*usual additives are milk and sugar.