铁哥们

• 釒(metal)RADICAL
• 戜(sound close to 'thiết')PHONETIC

A hard, dark gray metal that rings with the sound of steel is iron.

• 口(mouth; opening)RADICAL
• 可(can; agree)PHONO-SEMANTIC

An older brother is someone whose mouth always speaks approved words, repeated twice.

• 亻(person; human; man)RADICAL
• 门(door; gate)PHONETIC

Many people gathering at a door form a crowd — this is the plural suffix for person.