保安(bǎo ān) - security guard, security in Mandarin

保安 (bǎo ān) is the person on the door: the security guard at a bank, a building, a shopping centre, a factory gate. It is an ordinary job title, used without ceremony, and you will hear it far more often as a noun for the man himself than as an abstract idea.

The abstract sense does exist, in fixed phrases like 保安工作 (security work) and 保安措施 (security measures), but it stays inside those set combinations. Loose talk about safety in general takes 安全 instead.

The trap for an English speaker is treating 保安 as a straight translation of the English word security, which covers guards, systems, national defence and the feeling of being safe all at once. Chinese splits that job up: 保安 is the guard and the guarding, 安全 is safety, and financial security is 保障. Ask about 这里的安全 and you are asking whether the place is dangerous; ask about 这里的保安 and you are asking who is on the door.