There is a small list of singular – plural for kids.
Singular – Plural
activity |
activities |
addendum |
addenda |
address |
addresses |
advice |
advice |
aircraft |
aircraft |
aircraft |
aircraft |
alumna |
alumnae |
alumnus |
alumni |
analysis |
analyses |
ant |
ants |
antenna |
antennas |
antithesis |
antitheses |
apex |
apexes |
appendix |
appendices |
apple |
apples |
arch |
arches |
archipelago |
archipelagos |
attorney-general |
attorneys-general |
avocado |
avocados |
axis |
axes |
baby |
babies |
bacillus |
bacilli |
bacterium |
bacteria |
baggage |
baggage |
bamboo |
bamboos |
banana |
bananas |
banjo |
banjoes |
basis |
bases |
batch |
batches |
bay |
bays |
beach |
beaches |
beau |
beaux |
beef |
beeves |
berry |
berries |
bicycle |
bicycles |
binoculars |
goggles |
bison |
bison |
boar |
boars |
book |
books |
boss |
bosses |
box |
boxes |
boy |
boys |
branch |
branches |
brother-in-law |
brothers-in-law |
brush |
brushes |
buck (animal) |
bucks |
buffalo |
buffaloes |
bureau |
bureaux |
bus |
buses |
buzz |
buzzes |
bystander |
bystanders |
cactus |
cactuses |
calf |
calves |
cargo |
cargoes |
casino |
casinos |
catch |
catches |
chair |
chairs |
chief |
chiefs |
child |
children |
church |
churches |
class |
classes |
cliff |
cliffs |
clutch |
clutches |
coach |
coaches |
cod |
cod |
codex |
codices |
commander-in-chief |
commanders-in-chief |
commando |
commandos |
complex |
complexes |
computer |
computers |
concerto |
concerti |
corpus |
corpora |
court martial |
courts martial |
cow |
cows |
crisis |
crises |
criterion |
criteria |
cross |
crosses |
crossroads |
crossroads |
cupful |
cupfuls |
curriculum |
curricula |
daisy |
daisies |
datum |
data |
daughter |
daughters |
deer |
deer |
desperado |
desperadoes |
diagnosis |
diagnoses |
dice |
dice |
die |
dies |
disco |
discos |
dish |
dishes |
domino |
dominoes |
dormouse |
dormice |
dozen |
dozen |
dress |
dresses |
duo |
duos |
dwarf |
dwarves |
dynamo |
dynamos |
echo |
echoes |
egg |
eggs |
ellipsis |
ellipses |
embargo |
embargoes |
embryo |
embryos |
epoch |
epochs |
erratum |
errata |
Eskimo |
Eskimos |
eyelash |
eyelashes |
father-in-law |
fathers-in-law |
faux pas |
faux pas |
fez |
fezzes |
fish |
fishes |
flamingo |
flamingoes |
flash |
flashes |
flower |
flowers |
focus |
focuses |
focus |
focuses |
foot |
feet |
formula |
formulas |
fox |
foxes |
fresco |
frescoes |
fungus |
funguses |
furniture |
furniture |
garage |
garages |
gas |
gases |
general staff |
general staff |
genus |
genuses |
ghetto |
ghettoes |
giraffe |
giraffes |
glass |
glasses |
go-between |
go-betweens |
goose |
geese |
governor-general |
governors-general |
graffito |
graffiti |
grape |
grapes |
grouse |
grouse |
gymnastics |
gymnastics |
half |
halves |
halo |
haloes |
handful |
handfuls |
handkerchief |
handkerchives |
hawk |
hawks |
headquarters |
headquarters |
heir apparent |
heirs apparent |
hero |
heroes |
hoof |
hooves |
housewife |
housewives |
human |
humans |
hypothesis |
hypotheses |
inch |
inches |
index |
indexes |
information |
information |
itch |
itches |
jelly |
jellies |
jersey |
jerseys |
judge |
judges |
jug |
jugs |
kangaroo |
kangaroos |
Karen |
Karens |
kennels |
kennels |
key |
keys |
kilo |
kilos |
king |
kings |
kiss |
kisses |
knife |
knives |
knowledge |
knowledge |
lady |
ladies |
lamp |
lamps |
larva |
larvas |
lasso |
lassoes |
leaf |
leaves |
lens |
lenses |
libretto |
librettos |
life |
lives |
lily |
lilies |
loaf |
loaves |
lock |
locks |
louse |
lice |
lunch |
lunches |
mackerel |
mackerels |
magazine |
magazines |
maidservant |
maidservants |
man |
men |
mango |
mangoes |
man-of-war |
men-of-war |
match |
matches |
matrix |
matrixes |
means |
means |
medium |
mediums |
memento |
mementoes |
memorandum |
memorandums |
minus |
minuses |
minutia |
minutiae |
mix-up |
mix-ups |
monarch |
monarchs |
mongoose |
mongooses |
moose |
moose |
mosquito |
mosquitoes |
mother-in-law |
mothers-in-law |
motto |
mottoes |
mouse |
mice |
mouthful |
mouthfuls |
music |
music |
nebula |
nebulas |
negro |
negroes |
news |
news |
nose |
noses |
notary public |
notaries public |
nucleus |
nucleuses |
oasis |
oases |
offspring |
offsprings |
opus |
opuses |
orange |
oranges |
ovum |
ova |
ox |
oxen |
page |
pages |
paralysis |
paralyses |
parenthesis |
parentheses |
passer-by |
passers-by |
patch |
patches |
peach |
peaches |
person |
people |
phenomenon |
phenomenons |
photo |
photos |
phylum |
phyla |
piano |
pianos |
picture |
pictures |
place |
places |
pliers |
braces |
plus |
pluses |
potato |
potatoes |
potato |
potatoes |
prefix |
prefixes |
prognosis |
prognoses |
prospectus |
prospectuses |
public |
public |
quail |
quails |
quiz |
quizzes |
radio |
radios |
radius |
radiuses |
ratio |
ratios |
referendum |
referendums |
reindeer |
reindeers |
roe |
roes |
roof |
roofs |
rope |
ropes |
rose |
roses |
salmon |
salmons |
scarf |
scarves |
scenario |
scenarios |
scenery |
scenery |
self |
selves |
sergeant major |
sergeants major |
series |
series |
shampoo |
shampoos |
sheaf |
sheaves |
sheep |
sheep |
shelf |
shelves |
Sherpa |
Sherpas |
shrimp |
shrimps |
silo |
silos |
singular |
plural |
sister-in-law |
sisters-in-law |
six |
sixes |
slash |
slashes |
solo |
solos |
son-in-law |
sons-in-law |
species |
species |
spectacles |
scissors |
speech |
speeches |
spoof |
spoofs |
spoonful |
spoonfuls |
staff |
staff |
step-daughter |
step-daughters |
step-mother |
step-mothers |
step-parent |
step-parents |
stereo |
stereos |
stimulus |
stimuli |
stomach |
stomachs |
story |
stories |
stratum |
strata |
studio |
studios |
studio |
studios |
suffix |
suffixes |
swine |
swine |
swine |
swine |
syllabus |
syllabuses |
symposium |
symposiums |
synopsis |
synopses |
tableau |
tableaus |
tablespoonful |
tablespoonfuls |
takeoff |
takeoffs |
tattoo |
tattoos |
tax |
taxes |
thesis |
theses |
thief |
thieves |
thrush |
thrushes |
tomato |
tomatoes |
tooth |
teeth |
torpedo |
torpedoes |
toy |
toys |
trio |
trios |
trophy |
trophies |
trousers |
shorts |
trout |
trouts |
tuna |
tunas |
turf |
turves |
tuxedo |
tuxedoes |
vase |
vases |
vertebra |
vertebras |
vertex |
vertexes |
veto |
vetoes |
video |
videos |
virus |
viruses |
vita |
vitae |
volcano |
volcanoes |
vortex |
vortexes |
watch |
watches |
way |
ways |
well |
wells |
whale |
whales |
wharf |
wharves |
wife |
wives |
wish |
wishes |
wolf |
wolves |
woman |
women |
worker |
workers |
zero |
zeros |
zoo |
zoos |