Plural and singular

Enter the plural or the singular word of the words given
Quiz by cm134
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Last updated: May 7, 2016
First submittedSeptember 22, 2013
Times taken104
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Hint
Answer
watch
watches
jellies
jelly
glass
glasses
child
children
men
man
yourself
yourselves
goose
geese
scissors
scissors
fishes
fish
penny
pennies
ox
oxen
alumnus
alumni
hippopotamus
hippopotami/hippopotamuses
potato
potatoes
copy
copies
bacteria
bacterium
cactus
cacti
data
datum
dice
die
graffito
graffiti
genius
genii/geniuses
+1
Level 81
Sep 23, 2013
Both the OED and the American Heritage Dictionary of the English Language list "hippopotamuses" as a legitimate plural for "hippopotamus".
+1
Level 32
Sep 23, 2013
Hippopotamuses has been added as an acceptable answer