I need some help with words please

[workshy]

DD yr3 has to produce a list of 30 words which do not follow normal plural rules (-s, -es, -ies)

we've got to 18 and stuck

any suggestions gratefully recieved

Sheep?

children

Roof
Mouse

oxen
brethren
fish
fungi
criterion
datum

radius

dwarf
scarf

louse

Forum
Woman
I
He
She

Sorry - mixing up singulars and plurals. I'm sure you know what I mean.

Dice

half
calf
bacterium
forum
stimulus

Feet/foot
Formula
Rice
Sand

Deer

octopi
hippopotami
hair
men
women
geese

thanks everyone

teeth
lice
feet
fish (not fishes as some people think)
people

Hair?

louse
dwarf
elf
octopus
sheaf
wife
wharf
thief
person
scarf
knife
leaf
loaf
life
hoof
emphasis
syllabus
cod
cactus
crisis
fungus
oasis

Hair on your head- you wouldn't say "I am going to have my hairs cut."

Haha! You're right. I was thinking of one hair, many hairs.

But people do say I had the hairs in my ears or nose cut they just don't use that expression about the head.

And the expression it'll put hairs on your chest is also common.

Roofs vs rooves is the one that gets me.

I always say and write rooves, but very few people seem to. I don't know if it's a northern thing, or if it's because my mother is a pedant.

dwarves - dwarf
knives - knife
lives - life
wives - wife

mice - mouse

fruit

axis - axes

fruit is a bit like the hair example

one hair - lots of hair or hairs
one fruit - lots of fruit or fruits