Definition:
the noun form of 'running' describes an act of continuous motion, usually used to refer to an activity that implies traveling on foot. In this sense, 'running' acts as either a gerund or an otherwise uncountable noun.
Examples:
1. I'm going for a running later this evening.
2. The running stars should be on the lookout for obstacles in the race.
3. Her running skills have improved drastically since last year.
Definition:
the verb form of 'running' describes the action of moving on foot in a rapid, swift manner, usually over a short distance. It can also be used to describe the action of an object or entity which is in motion over a longer period of time. In either usage, the verb is rendered in the present participle form, 'running.'
Examples:
1. The dog is running around the yard.
2. We are running late for the meeting.
3. The river is running along the bank.
Tips:
additionally, the verb form of 'running' is not usually used in the sense of 'operating a business' in this particular form; to describe this particular action, 'run' is more appropriate.