(I). Do not confuse pronunciation of words with their spelling. Learn to practice what you hear, not what you see.

(II). In English, many words are there which:

have the same spellings but are pronounced differently.
have the same pronunciation but are written differently with different meanings.
Use Google to hear how a word is pronounced. Type word with meaning in search. Example: Accommodation meaning and click on small speaker icon to hear the pronunciation of the word.
Pronunciation in English.
For basic pronunciation rules: For effective communication, it is important to pronounce words clearly.
 

One must know the correct spelling of the words. Some of the importance of knowing correct spellings is

It enables effective communication
Spelling helps in reading
It helps in understanding the relation between the sound and the words
It helps in effective writing
Spelling helps in maintaining a good impression
Spelling – pronunciation-the letters in brackets aren’t usually pronounced

aspirin – asp(i)rin asp/rin
business – bus(i)ness bus/ness
chocolate – choc(o)late choc/lat
different – diff(e)rent diff/rent
evening – ev(e)ning ev/ning
every – ev(e)ry ev/ry
marriage – marri(a)ge ma/rige
omelette – om(e)lette om/let
restaurant – rest(au)rant rest/ rant
several – sev(e)ral sev/ral
Wednesday – We(d)n(e)sday wens/day
comfortable – comf(or)table comf/ta/ble
interesting – int(e)resting in/tres/ting
secretary – secret(a)ry se/cre/try
temperature – temp(e)rature tem/pra/ture
usually – us(u)ally u/sa/lly
vegetable – veg(e)table veg/ta/ble