small letter
lowercase
lower-case letter
minuscule

But you can have it with a small letter.

Underneath, in smaller green letters, were the details of the food drive.

I've been enjoying the arts (small letters) for more than 50 years.

The author's name was printed below the picture in small white letters.

The name says "capital", but it is a small letter.

The lines were printed in the usual small black letters on white paper.

And the "b" in this bank was a small letter, not a capital.

The answer to his questions stood in small red letters on the otherwise dark monitor screen.

Otherwise one has to write with a small letter after a colon.

Only in smaller black letters did it say the road was a public one.