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

moose!

mouse
louse
loaf
stadium
calf
foot
tooth
child
man
woman
hoof
leaf
sheep
hoof
roof

Octopus or does it lol

cattle, oxen, reindeer.

'rooves' is incorrect afaik. Plural of roof is roofs

Should the list include uncountable nouns that use a phrase to identify plurals (e.g. A school of fish) or just irregular plurals?

If the latter, I'd try to include one per type:
Loaf/ves
Man/men
Medium/a
Crisis/crises
Index/indices
Mouse/mice
Child/children
...