6 letter words:
begirt9,
5 letter words:
befit10,
brief10,
fiber10,
fibre10,
grief9,
grift9,
giber8,
refit8,
biter7,
tribe7,
tiger6,
4 letter words:
frig8,
gift8,
berg7,
brig7,
fire7,
fret7,
frit7,
gibe7,
reft7,
reif7,
rife7,
rift7,
tref7,
bier6,
bite6,
brie6,
brit6,
girt5,
gite5,
grit5,
trig5,
rite4,
tier4,
tire4,
3 letter words:
fib8,
fig7,
beg6,
big6,
eft6,
fer6,
fet6,
fie6,
fir6,
fit6,
gib6,
ref6,
rif6,
bet5,
bit5,
reb5,
rib5,
erg4,
get4,
gie4,
git4,
reg4,
rig4,
teg4,
ire3,
rei3,
ret3,
tie3,
2 letter words:
ef5,
fe5,
if5,
be4,
bi4,
er2,
et2,
it2,
re2,
ti2,