“FILIALLY” is a valid word. — 14 points Scrabble

filialdesignating the generation or the sequence of generations following the parental generation

fillya young female horse under the age of four
flailan implement consisting of handle with a free swinging stick at the end; used in manual threshing
allylthe univalent unsaturated organic radical C3H5; derived from propylene
ilial

allquantifier; used with either mass or count nouns to indicate the whole number or amount of or every one of a class
flytwo-winged insects characterized by active flight
laya narrative song with a recurrent refrain
illan often persistent bodily disorder or disease; a cause for complaining
faya small being, human in form, playful and having magical powers
fil
ailaromatic bulb used as seasoning

if
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laa white soft metallic element that tarnishes readily; occurs in rare earth minerals and is usually classified as a rare earth
ala silvery ductile metallic element found primarily in bauxite
lia soft silver-white univalent element of the alkali metal group; the lightest metal known; occurs in several minerals
ay
aian agency of the United States Army responsible for providing timely and relevant and accurate and synchronized intelligence to tactical and operational and strategic level commanders
fathe syllable naming the fourth (subdominant) note of the diatonic scale in solmization

FILIALLY