Some nouns are also verbs. The only difference is the way they are stressed and pronounced.
noun: the stress is on the first syllable
verb: the stress is on the second syllable
Their meanings are very similar in most cases.
nouns/verbs distinguished by stress:
conduct, discount, entrance, progress, export, import, object
nouns distinguished by pronunciation
noun: the ending is pronounced with no "voice" or is pronounced is softly
verb: the ending is stressed
nouns and verbs with the same spelling and pronunciation
act, attempt, blame, book, call, climb, copy, cost, dance, drink, drive, fall, fear, help, joke, kiss, laugh, try, vote, wait, walk, wash, wish
bang, bark, buzz, grunt, hiccup, moan
butcher, judge, model, nurse