That would be all words, since semantic change is an observed phenomenon in all languages.

Nouns changing into verbs is a common feature of English. Curb, date, elbow, interview, panic, and park are all verbs that started as nouns. According to the American Heritage Dictionary, “Impact has been used as a verb since 1601, when it meant “to fix or pack in,” and its modern, figurative use dates from 1935.”