Senhor is a Portuguese word that translates to "mister" or "sir" in English. If you are looking for synonyms for this word, you can use alternative titles to display respect and politeness towards an older or a more superior man. Some options include "dom" which is similar to "lord" or "supreme ruler" in meaning. "Cavalheiro" can be used to refer to a gentleman or even a courteous person. Another option is "patrão" which is used to refer to a boss or an employer. Using these synonyms can help in expressing appreciation and respect towards a person of higher authority.