/ɜː/

er

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her /hɜː/
were /wɜː/
herb /hɜːb/
herd /hɜːd/
serve /sɜːv/
fern /fɜːn/
verse /vɜːs/
nerve /nɜːv/
term /tɜːm/
verb /vɜːb/
concern /kənˈsɜːn/
perfect /ˈpɜːfɪkt/

ir

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fir /fɜː/
sir /sɜː/
dirt /dɜːt/
bird /bɜːd/
firm /fɜːm/
girl /gɜːl/
shirt /ʃɜːt/
stir /stɜː/
first /fɜːst/
swirl /swɜːl/
flirt /flɜːt/
skirt /skɜːt/
squirt /skwɜːt/
squirm /skwɜːm/
dirty /ˈdɜːti/
circle /ˈsɜːkl/
circus /ˈsɜːkəs/

ur

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fur /fɜː/
curl /kɜːl/
hurl /hɜːl/
surf /sɜːf/
turf /tɜːf/
nurse /nɜːs/
purse /pɜːs/
curve /kɜːv/
burn /bɜːn/
hurt /hɜːt/
turn /tɜːn/
burst /bɜːst/
purple /ˈpɜːpl/

or

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word /wɜːd/
work /wɜːk/
worse /wɜːs/
world /wɜːld/
worst /wɜːst/

ear

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earn /ɜːn/
earth /ɜːθ/
heard /hɜːd/
learn /lɜːn/
search /sɜːʧ/
early /ˈɜːli/