7 letter words:
barrier9,
5 letter words:
barer7,
barre7,
briar7,
brier7,
rebar7,
airer5,
rarer5,
4 letter words:
abri6,
bare6,
bear6,
bier6,
birr6,
brae6,
brie6,
brrr6,
rare4,
rear4,
3 letter words:
arb5,
bar5,
bra5,
brr5,
reb5,
rib5,
air3,
are3,
ear3,
era3,
err3,
ire3,
rai3,
rei3,
ria3,
2 letter words:
ab4,
ba4,
be4,
bi4,
ae2,
ai2,
ar2,
er2,
re2,