use '?' for JOKER (blank)

From letters F, E, T, T, E, R, I, N, G  I made following words

9 letter words

fettering[13]

8 letter words

fretting[12]

7 letter words

feigner[11], freeing[11], reefing[11], fetting[11], integer[8], treeing[8], tergite[8], gittern[8], retting[8], nettier[7], tentier[7]

6 letter words

feeing[10], finger[10], fringe[10], giftee[10], feting[10], ferine[9], refine[9], fetter[9], fitter[9], titfer[9], teeing[7], gerent[7], regent[7], engirt[7], getter[7], entire[6], retine[6], triene[6], tentie[6], netter[6], tenter[6], retint[6], tinter[6]

5 letter words

feign[9], grief[9], grift[9], finer[8], infer[8], feint[8], refit[8], fritt[8], genie[6], genre[6], green[6], reign[6], renig[6], genet[6], tenge[6], tinge[6], egret[6], greet[6], tiger[6], retie[5], enter[5], rente[5], terne[5], treen[5], inert[5], inter[5], niter[5], nitre[5], trine[5], tenet[5], tetri[5], titer[5], titre[5], trite[5]

4 letter words

frig[8], gift[8], fine[7], neif[7], fere[7], free[7], reef[7], fire[7], reif[7], rife[7], fern[7], firn[7], feet[7], fete[7], fret[7], reft[7], tref[7], frit[7], rift[7], gene[5], gien[5], eger[5], gree[5], girn[5], grin[5], ring[5], gite[5], gent[5], ting[5], girt[5], grit[5], trig[5], erne[4], rein[4], teen[4], nite[4], tine[4], rete[4], tree[4], rite[4], tier[4], tire[4], rent[4], tern[4], nett[4], tent[4], tint[4], tret[4]

3 letter words

fig[7], fee[6], fie[6], fen[6], fin[6], fer[6], ref[6], fir[6], rif[6], eft[6], fet[6], fit[6], gee[4], gie[4], eng[4], gen[4], neg[4], gin[4], erg[4], reg[4], rig[4], get[4], teg[4], git[4], nee[3], ere[3], ree[3], ire[3], rei[3], ern[3], rin[3], tee[3], tie[3], net[3], ten[3], nit[3], tin[3], ret[3], tet[3], tit[3]

2 letter words

ef[5], fe[5], if[5], en[2], ne[2], in[2], er[2], re[2], et[2], it[2], ti[2]