Look Up The Pronunciation Of These Words Before Using Them*
Three mistakes: educated native speaker
Five mistakes: educated foreigner
25 mistakes: the Facebook generation

minute (small) – minute (time unit)
forte (strong side) – forte (loud; music)
line – lineage
bloom – blood
fuselage – foliage
jackal – funeral
despite – respite
orchard – orchid
new – sew
monarch – arch – architect
vomit – omit
alga – algae
sting – stingy
psychosis – metempsychosis
preface – interface – volteface
word – sword
grove – dove
earth – dearth – hearth
bull – but – bury – burr
chase – phrase
chase – chasm
bestow – endow
imprudent – impudent
impassible – impasse
broad – road
county – country
bay – bayou
exhale – exhaust
gauge – audacity
miner – examiner
ratio – ratiocination
sea – seamstress
mullion – bullion
indolence – condolence
science – prescience
predict – indict – victuals
pedagogic – demagogic
height – weight, freight
garage – baggage
prey – osprey

Sean – Seamus
Michael – Michaelmas
isle – Isleworth
mouth – Monmouth
Kansas – Arkansas
cheese – Chicago
mite – Yosemite
cayman – Cayman
Leigh – Leicester
lough – Loughborough
worst – Worcester
liar – Liam
Evander – Evans
early – Eames
ear – Eakins

* E. g. in Kenyon & Knott: “A Pronouncing Dictionary Of American English”, Springfield (Mass.) 1975