weather, climate
weather一天内具体的天气状况;
climate长期的'气候状况 eg:The climate here is not good for you.
road, street, path, way
road具体的公路，马路;eg:take this road
street街道;eg:in the street
path小路，小径;
way道路，途径 eg:show me the way to the museum.
course, subject
course课程(可包括多门科目);eg:a summer course
subject科目(具体的学科)
custom, habit
custom传统风俗，习俗，也可指生活习惯，后接to do;
habit生活习惯，习惯成自然，后接of doing. eg:I've got the habit of drinking a lot.
