“NIFFER” is a valid word. — 12 points Scrabble

finemoney extracted as a penalty
firethe event of something burning (often destructive)
fernany of numerous flowerless and seedless vascular plants having true roots from a rhizome and fronds that uncurl upward; reproduce by spores
riffa Berber living in northern Morocco
reinone of a pair of long straps (usually connected to the bit or the headpiece) used to control a horse
fifea small high-pitched flute similar to a piccolo; has a shrill tone and is used chiefly to accompany drums in a marching band
rifemost frequent or common
fiefa piece of land held under the feudal system
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neif

finthe cardinal number that is the sum of four and one
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ref(sports) the chief official (as in boxing or American football) who is expected to ensure fair play
firnonresinous wood of a fir tree
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fen100 fen equal 1 yuan in China
effhave sexual intercourse with
irea strong emotion; a feeling that is oriented toward some real or supposed grievance
ernbulky greyish-brown eagle with a short wedge-shaped white tail; of Europe and Greenland
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ina unit of length equal to one twelfth of a foot
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era trivalent metallic element of the rare earth group; occurs with yttrium
rea rare heavy polyvalent metallic element that resembles manganese chemically and is used in some alloys; is obtained as a by-product in refining molybdenum
enhalf the width of an em
nea colorless odorless gaseous element that give a red glow in a vacuum tube; one of the six inert gasses; occurs in the air in small amounts
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NIFFER