(Blank)
radio
radios
boss
bosses
thief
thieves
puppy
puppies
moose
moose
hero
heroes
dish
dishes
wolf
wolves
galley
galleys
octopus
octopi
volcano
volcanos / volcanoes
tax
taxes
knife
knives
quality
qualities
scissors
scissors
stereo
stereos
sketch
sketches
belief
beliefs
penny
pence
species
species
kangaroo
kangaroos
stomach
stomachs (-ch sounds "k")
roof
roofs
standby
standbys
phenomenon
phenomena