today, I have only here a little set of words on how you use the word Friend (친구).
I'll be trancribing these words and pronounce it correctly soon. Thank you and happy learnings.

Friendly Korean
한국 친구끼리 하는말

friends
친구들

Most Koreans have a ton of different friends and acquaintances, and they have a pupu platter of words they use to describe those different relationships. It’s no different in the States, really. After all, here you’ve got your BF or GF,your BFF, your booty call, your homies, your Facebook friends, and, of course, who aren’t actually real people, let alone real friends.

Friend친구

Are you my real friend?
너 진짜 내 친구 맞아?

Total stranger
모르는 사람 / 처음 본 사람

That total stranger smiled all creepy at me!
첨 보는 사람이 나보고 징그럽게 웃었어!

Acquaintance
아는 사람

She’s just an acquaintance from school.
학교에서 그냥 아는 사람이야.

Coworker
회사동료

My coworker is slacking and giving me all his work.
내 회사 동기가 자꾸 일을 나한테 떠 넘겨.

Homey
불알 친구

Literally, “testicle friends,” i.e., you’ve been friends since you were babies when it was all good to see each other’s nutsacks. To be used among men only.

He’s my homey.
내 불알친구야.

Next-door neighbor.
옆집 친구/ 이웃

My next-door neighbor is like family.
내 옆집사람은 내 이웃사촌이지.

Literally, “neighbor cousin.” Friends from same town
동내 친구

Study buddy
같은 과 친구
This is used for university students referring to friends from the same major.

School friend
학교 친구

Housemate
동거인

My housemate farts all day long.
내 동거인 방구 맨날껴.

Roomie 
방짝
Hey roomie, stop eating my kimchi and buy your own!
야 방짝, 내 김치 먹지말고 너꺼 사먹어!

BFF (mainly used by girls in grade school)
단짝

Best friend
제일 친한 친구

Partner (someone who sits next to you in grade school)
짝궁

Girlfriend
여자친구

GF
여친

Traitor
배신자

Hey, you traitor!
야 이 배신자야!

Dude
임마 / 자식

Dude, where’s my car?
임마, 내 차 어딧냐?