【Frown】 , 【scowl】 , 【glower】 , 【lower】 , 【gloom】 are comparable when they mean to put on a dark or malignant countenance or aspect.
【Frown】 commonly implies a stern face and contracted brows that express displeasure, disapprobation, anger, or contempt.
【Scowl】 carries an implication of wrinkled drawn-down brows that express ill humor, sullenness, or discontent.
【Glower】 implies a more direct stare or gaze than 【frown】 or 【scowl】 and carries a stronger connotation of anger, contempt, or defiance.
【Lower】 implies a menacing darkness and sullenness of face or of aspect; the term is used in reference not only to persons but to skies that give promise of a storm.
【Gloom】 ordinarily carries a much stronger implication of gloominess or dejection and a much weaker (often nonexistent) suggestion of threatening than does 【lower】 .
