A delicious rubber like candy that people chew when they are bored or are hungry for sugar.
Bubblegum is gum you chew and can blow bubbles out of.
Chewing gum can only be chewed, most people chew chewing gum for fresh breath.
Gum has many different flavors.
Most common for bubblegum: Strawberry
Most common for chewing gum: Peppermint
I grabbed a delicious piece of Wrigley's 5Gum and chewed on it, mostly because being in the car for so long bored me.