Trap doors are commonly used for secret or concealed entryways, and depending on the context, there are different synonyms to describe these types of doors. Some alternatives for trap door may include hatch, access panel, secret door, concealed entrance, and hidden portal. These options may be used when describing different types of entrances or exits that can be opened or closed during various situations. For example, hatches are often used on boats or ships, access panels are found in buildings to access plumbing or electrical systems, secret doors might be used in a home for a safe or panic room, and concealed entrances could be found in a castle for a secret passage.