There are lots of words in the English language which sound the same but are spelled differently and have another meaning entirely. They are called homonyms. Here are a few to know.
ad - advertisement
add - combine  
advice - guidance
advise - recommend  
altar – table in church
alter – to change          
cell – compartment
sell – vend
 
cereal – breakfast food
serial – sequential
close – opposite of open
clothes – clothing 
complement – enhance; go together
compliment – praise
 
dear – term of endearment
deer– woodland animal
 
desert – dry land
dessert – after-dinner sweet course
 
doe – female deer
dough – uncooked bread
fair – equal
fare – price  
fairy – fictitious tiny winged ‘human’ – Tinkerbell
ferry – boat / ship for cars, cargo or passengers
find - to discover
fined – charged a penalty
flew – did fly
flu – cold-like illness
 
flour – powdery, ground grain
flower – blooming plant
 
foreword - introduction to a book
forward – advancing
 
gene – a chromosome
jean – denim
 
gorilla – big ape
guerrilla - warrior
 
hay – straw animal food
hey – greeting
 
heal – mend
heel – back of foot
 
hear – to listen
here – at this place
hole – opening
whole – entire  
hour – 60 minutes
our – belonging to us
knight – feudal horseman
night – evening
 
knot – tied rope
not – negative
 
know – have knowledge
no – opposite of yes  
none – not any
nun – woman who takes special vows
 
one – single
won – did win
peace – calm
piece – segment
patience – being willing to wait
patients – person treated in a hospital or by a doctor  
pear – a type of fruit
pair – 2 (usually matching)  
plain – ordinary
plane – flight machine plane; flat surface
 
poor – not rich
pour – make flow
 
right – correct; not left
write – scribble
 
rose – flower
rows – lines
sail – move by wind power
sale – bargain price
 
scene – landscape
seen – viewed  
sea – ocean segment
see – observe with eyes
son – male child
sun – the star that lights the solar system  
stair – step
stare – to look at steadily
suite – room in a hotel with lounge area etc
sweet – the opposite of sour   
wait – kill time
weight – measure    
way – path
weigh – measure mass
 
weak - not strong
week – 7 days
 
which – that
witch – sorcerer
 
There are many, many more. In speech it is almost impossible to tell the difference but look at the spelling when written. The rest of the sentence should help you understand which is correct. 
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