1. clothes, cloth, clothing
clothes统指各种衣服，谓语动词永远是复数， cloth指布，为不可数名词 clothing 服装的总称，指一件衣服用a piece of, an article of
2. incident, accident
incident指小事件, accident指不幸的事故He was killed in the accident.
3. amount, number
amount后接不可数名词， number后接可数名词 a number of students
4. family, house, home
home 家，包括住处和家人，house房子，住宅，family家庭成员. My family is a happy one.
5. sound, voice, noise
sound自然界各种各样的声音，voice人的嗓音，noise噪音I hate the loud noise outside.
6. photo, picture, drawing
photo用照相机拍摄的照片，picture可指相片，图片，电影片，drawing画的画 Let's go and see a good picture.
7. vocabulary, word
vocabulary词汇，一个人拥有的单词量，word具体的单词He has a large vocabulary.
8. population, people
population人口，人数，people具体的人 China has a large population.
9. weather, climate
weather一天内具体的天气状况，climate长期的气候状况 The climate here is not good for you.
10. road, street, path, way
road具体的公路，马路，street街道，path小路，小径，way道路，途径
take this road; in the street, show me the way to the museum.
11. course, subject
course课程(可包括多门科目)，subject科目(具体的学科)a summer course
12. 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. I've got the habit of drinking a lot.
13. cause, reason