The phrase "strong odor" can be used to describe a variety of unpleasant smells, but there are many other synonyms that can convey the same meaning. For example, we could say "pungent odor" to describe a particularly strong and intense smell. "Foul odor" is another option, particularly when the smell is associated with decay or rotting. "Putrid odor" or "noxious odor" can also be used to describe a smell that is particularly offensive or overpowering. Finally, "rank odor" may convey a sense of unpleasantness or offensiveness, suggesting a smell that is overpowering and difficult to ignore.