Wassup vs. Hello

Difference Between Wassup and Hello
Wassupinterjection
(slang) what's up? (as a greeting)
Hellointerjunction
Used to greet someone, answer the telephone, or express surprise.
Hellonoun
A calling or greeting of "hello."
Helloverb
To call "hello."
Hellointerjection
A greeting (salutation) said when meeting someone or acknowledging someone’s arrival or presence.
Hello, everyone.Hellointerjection
A greeting used when answering the telephone.
Hello? How may I help you?Hellointerjection
A call for response if it is not clear if anyone is present or listening, or if a telephone conversation may have been disconnected.
Hello? Is anyone there?Hellointerjection
(colloquial) Used sarcastically to imply that the person addressed or referred to has done something the speaker or writer considers to be foolish.
You just tried to start your car with your cell phone. Hello?Hellointerjection
An expression of puzzlement or discovery.
Hello! What’s going on here?Hellonoun
"Hello!" or an equivalent greeting.
Helloverb
(transitive) To greet with "hello".
Hellonoun
an expression of greeting;
every morning they exchanged polite hellos