At present, we know next-to-nothing about the "surface" of Jupiter, or even if the idea of a "surface" has any meaning for Jupiter.
In fact it could be smooth or bumpy, it mostly depends on what foods you eat.
Argon is a gas and, like any gas, it is neither smooth nor bumpy.
Smooth
They are smooth and soft.
Lead has a smooth texture.
Slimy and smooth
no
smooth as a baies foot
Streptococcus bacteria are considered smooth because they do not possess flagella or pili that create a bumpy appearance. They generally appear as smooth, round colonies when grown on agar plates.
bumpy and smooth
bumpy, rugh
bumpy yet smooth.