I'm studing the english pronunciation with a site that pronunce every kind of word. Sometime happens that a word that could be both a noun and a verb, has two different pronunciation with regards to the accent. For example, if I search for "protest" that site said: "Protest" as a noun = pròtest. "Protest" as a verb = protèst. (Sorry I don't know how to write the phonetic symbols). Now I would like to know: are these differences real in the spoken language, or are they just formalism that almost noone use?