| Acquaintance | Ally | Amigo |
| Associate | Backer | Bestie |
| Bff (best friends forever) | Bro | Brother from another mother |
| Bud | Buddy | Chum |
| Classmate | Close friend | Companion |
| Compeer | Comrade | Confidant |
| Crony | Fellow | Mate (British) |
| Flatmate | Friends | Homie |
| Pal | Pally | Partner |
| Playmate | Roommate | Schoolmate |
| Second self | Sidekick | Sister |
| Sister from another mister | Soul mate | Teammate |
| Workmate |
