Hello

/həˈləʊ,hɛˈləʊ/
A salutation or a greeting, mostly used to start conversations and conversations on the telephone. Hi,hey and 'sup are used in the same situation.

Pronounciation: (British english and american english)
heh·low

Informal:
Hi
Yo
'sup
Hey
Hiya
Howdy

Howya
'Yello
Herro

Formal:
Goodmorning
Hello
Good afternoon

Good evening
It's nice to meet you
It's a pleasure to meet you (These last two only work when you are meeting someone for the first time.)

noun

an utterance of ‘hello’; a greeting.
"she was getting polite nods and hellos from people"

Verb
say or shout ‘hello’.
"I pressed the phone button and helloed"

Neighbour:Hey, Person1!
Person1: He

Nigga

''Nigga'' Is a racist slur for african americans, and most people use it for insulting black people.

RacistPerson1: Yo wassup you fucking nigga!
AfricanAmerican: Stop calling me that!