maths class, mathematics
fear
sore throat
toothache
gastritis
inflammation of the ear
burn
tooth (singular), teeth (plural)
dank
artery, arteries
veins
Eiffel Tower
Chinese Wall
how are you?
What's her/his gender?
date of birth
who is she?, who?, who is he?
joist (wood), beam (metal)
2 euros
lawnmower
marbles
hopscotch
restaurant
theatre
northern hemisphere