【Courtesy】 , 【amenity】 , 【attention】 , 【gallantry】 are comparable when they denote a manner or an act which promotes agreeable or pleasant social relations.

【Courtesy】 suggests consideration for others or deference (as to their rank, sex, or age); it usually implies good breeding and acquired graces but it sometimes connotes innate gentleness or instinctive politeness rather than social training.

【Amenity】 implies a disposition to make easy the approach to or the continuance of pleasant social relations; when used concretely it may be applied not only to words or acts but to pursuits, interests, or facilities that bring men into rapport.

【Attention】  implies a singling out of a particular person for special favor or consideration, or as the recipient of courtesies showing one′s admiration or love (as in courting).

【Gallantry】 stresses devoted 【attention】 , sometimes amorous 【attention】 , to a lady; it also often connotes ingratiating personal qualities (as ease of address, a dashing style, or a polished manner).