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From letters G, R, A, V, I, T, A, T, I, O, N, A, L, L, Y  I made following words

15 letter words

gravitationally[22]

13 letter words

variationally[19], gravitational[17]

12 letter words

intravitally[18]

11 letter words

antigravity[18], variolating[15], gravitation[15], variational[14], rationality[14], agitational[12]

10 letter words

virginally[17], vigilantly[17], volatility[16], invitatory[16], travailing[14], originally[14], gyrational[14], trigonally[14], rattlingly[14], intravital[13], notarially[13], rationally[13], natatorial[10]

9 letter words

vaginally[16], vainglory[16], vagrantly[16], valiantly[15], trivially[15], rivalling[13], gallivant[13], violating[13], variating[13], navigator[13], gravitino[13], gallantry[13], trollying[13], vallation[12], antiviral[12], variation[12], antiroyal[12], atonality[12], lariating[10], alligator[10], tailoring[10], agitation[10], allotting[10], totalling[10], antitragi[10], litigator[10], natatoria[9]

8 letter words

livingly[15], lovingly[15], ravingly[15], rovingly[15], vagility[15], villainy[14], lavatory[14], vanitory[14], vitality[14], nativity[14], availing[12], vialling[12], rivaling[12], virginal[12], aviating[12], galavant[12], galivant[12], vigilant[12], avigator[12], graviton[12], vittling[12], allaying[12], alloying[12], laryngal[12], rallying[12], tallying[12], antilogy[12], gyration[12], grittily[12], aviation[11], lavation[11], volitant[11], vitiator[11], atonally[11], tarnally[11], natality[11], latinity[11], tonality[11], natatory[11], original[9], intaglio[9], ligation[9], ringtail[9], trailing[9], trilling[9], rigatoni[9], trigonal[9], trolling[9], litigant[9], totaling[9], attagirl[9], attiring[9], rattling[9], agitator[9], rotating[9], illation[8], notarial[8], rational[8], antiroll[8], trillion[8], tarlatan[8], littoral[8], tortilla[8], antiriot[8]

7 letter words

vaginal[11], vailing[11], vialing[11], vagrant[11], vatting[11], allying[11], analogy[11], angrily[11], agility[11], yatagan[11], antigay[11], trilogy[11], vanilla[10], villain[10], valonia[10], ovarial[10], variola[10], ravioli[10], ovarian[10], valiant[10], invital[10], travail[10], trivial[10], variant[10], vitrain[10], aviator[10], vitriol[10], laniary[10], rainily[10], anality[10], anility[10], tonally[10], riantly[10], orality[10], nattily[10], totally[10], tartily[10], trinity[10], analgia[8], logania[8], angaria[8], lairing[8], railing[8], rilling[8], gorilla[8], granola[8], ligroin[8], roiling[8], rolling[8], ignatia[8], intagli[8], tailing[8], gallant[8], lilting[8], tilling[8], otalgia[8], galliot[8], antilog[8], toiling[8], tolling[8], granita[8], airting[8], tirling[8], orating[8], ignitor[8], rioting[8], tilting[8], titling[8], agitato[8], glottal[8], toiting[8], lotting[8], ratting[8], tarting[8], rotting[8], lanital[7], alation[7], talaria[7], antiair[7], litoral[7], titania[7], rattail[7], tantara[7], tartana[7], arnatto[7], introit[7]