What's the noun for fellest? Here's the word you're looking for.
fall
The act of moving to a lower position under the effect of gravity.
A reduction in quantity, pitch, etc.
(Canada) The time of the year when the leaves typically fall from the trees; autumn; the season of the year between the autumnal equinox and the winter solstice. [from 16th c.]
A fruit that falls from the tree, rather than being picked.
(engineering) A part which acts by falling, such as a stamp in a fulling mill, or the device in a spinning machine to arrest motion when a thread breaks.
“Timbera was a faller in last year's race but jockey Culloty had a good feeling about the nine-year-old before the off.”
“Bote he is dem young faller bane goin' 'round hare dees two, t'ree days, lukin' lak preacher out of a yob.”
“One hand faller is still on staff to handle some of the larger trees in the steeper terrain, but almost all of the work is done with mechanized equipment.”
“Epilepsies, or fallings and reelings, and beastly vomitings. The least of these, even when the tongue begins to be untied, is a degree of drunkenness.”