8 letter words:
doorknob15,
5 letter words:
brook11,
kroon9,
brood8,
dobro8,
boron7,
donor6,
rondo6,
4 letter words:
bonk10,
book10,
bork10,
knob10,
kobo10,
dork9,
nook8,
rook8,
bond7,
boon6,
boor6,
born6,
broo6,
door5,
odor5,
ordo5,
rood5,
3 letter words:
kob9,
kor7,
bod6,
boo5,
bro5,
nob5,
orb5,
rob5,
don4,
dor4,
nod4,
rod4,
noo3,
nor3,
ono3,
2 letter words:
bo4,
do3,
od3,
no2,
on2,
or2,
