There are instants, as in "Johnny get away from that hot stove this instant!" or moments as in "She took a moment to gather her wits," or even periods as in "The class period ended with the bell." And ages and epochs, and hours, days, weeks and months, and cycles and eons and years. All terms used to describe time:
"Time flies. Time waits for no man. Time heals all wounds. All of us want more time. Time to stand up. Time to grow up. Time to let go. Time is money. Time well spent." - Unknown quotes
And because there is time, everything is a process. A process of change from one moment to the next, from one state to another, from one form to a different one.
Change and time the two constants in this universe, because even the sun will explode or collapse eventually. Both constants yet ever-moving.
PROCESS n. 1. 2.