Nouns

(n)trafficthe aggregation of things (pedestrians or vehicles) coming and going in a particular locality during a specified period of time
(n)trafficbuying and selling; especially illicit trade
(n)trafficthe amount of activity over a communication system during a given period of time“heavy traffic overloaded the trunk lines”, “traffic on the internet is lightest during the night”
(n)dealings, trafficsocial or verbal interchange (usually followed by `with')

Verbs

(v)trafficdeal illegally“traffic drugs”
(v)traffictrade or deal a commodity“They trafficked with us for gold”