Unlike homophones which are words with two spellings and two meanings but only one pronunciation, homographs are words which have one spelling but two different pronunciations and two distinct meanings or usages.
Some common homographs:
bəʊ (to play the violin)
baʊ (to bend from the waist)
məʊ (to cut the grass)
maʊ (to grimace)
'pæstɪ (Cornish pie)
'peɪstɪ (pale)
tɪə (liquid from your eyes)
teə (a rip)
səʊ (to spread seeds)
saʊ (a female pig)
rəʊ (to propel a boat)
raʊ (to argue)