Openers' is a broad term that can refer to many different things. DOORMEN are people who open doors FOR others, usually in a professional setting such as a hotel or office building. Passkeys are special keys that allow access to certain areas, such as a restricted area of a building. KICKOFFS are the beginning of an event, such as a football game or a meeting. INTROS are introductions, usually at the start of a presentation or speech. FOR is a preposition used to indicate the purpose of something. Keys are objects used to open locks. Exhibition games are sporting events that are not part of a regular season, but are instead used to showcase a team's skills.