The word "doored" is a past participle of the verb "door," which means to provide with a door or to close with a door. Some synonyms of "doored" include "shut," "closed," "sealed," "locked," and "barred." An example of the use of the word "doored" in a sentence could be, "The building was doored tightly to prevent unauthorized access." Other related synonyms for "door" include "entryway," "portal," "gateway," and "threshold." It is important to use appropriate synonyms to enhance communication and improve writing skills.