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facula
A circular to subcircular region which is brighter than the surrounding area.
filament
A strand of cool gas suspended over the photosphere by magnetic fields, which appears dark as seen against the disk of the Sun; a filament on the limb of the Sun seen in emission against the dark sky is called a prominence.
fireball
A bright meteor.
fissure
a narrow opening or crack of considerable length and depth.
fluctus
Flow terrain.
fossa
A long, narrow, shallow depression.
fracture
A break or crack.
friction
The rubbing of one surface or thing again another.
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