"Upper-case" is to "capital" as "lowercase" is to what?
Is there a corresponding word to go with capital to mean lower-case?
There are capital letters and small letters.
In a formal or technical context I would use "lower-case" to avoid seeming like a young child talking about big letters and small letters.
In typography and calligraphy the corresponding terms are majuscule and minuscule:
See the Wikipedia entry on Capital letters. Minuscule also serves as the counterpart of capital.
For this analogy question, small is the word you are looking for:
uppercase : capital :: lowercase : small
small (adj): lowercase
Definition 1b of small in Merriam-Webster
Minuscule is also the word for them, although I doubt most people would know what you were talking about.
No, there is no equivalent (Like Pedi-Letter or something "Foot" related instead of "Head" related.)
You have the following options
- lowercase
- lowercase letter
- minuscule
- small letter
Although I do not recommend 3 unless you are amongst typographers, nor 4 (you will sound childish).