"Laying door" is not a word, but assuming the intended word is "doorway", antonyms for this word would be exit, opening, or portal. An exit refers to a way out, whereas a doorway is an entryway. The word "opening" implies a lack of obstruction, while a doorway is a partially enclosed space. Lastly, a portal is a grand entrance or means of access, while a doorway is a simpler entryway. Antonyms are useful in language as they allow for precision and variety in communication, and understanding their meanings can help expand one's vocabulary.