There are so many!
awash
bosh
brioche
caroche
cloche
cohosh
cosh
eyewash
frosh
gallosh
ganache
gnosh
gosh
gouache
goulash
guilloche
hogwash
josh
kibosh
kosh
macintosh
mackintosh
mosh
musquash
panache
posh
quash
slosh
wash
Osh Kosh B'Gosh