1. clothes, cloth, clothing
clothing 服装的总称，指一件衣服用a piece of, an article of
2. incident, accident
accident指不幸的事故 He was killed in the accident.
3. amount, number
number后接可数名词 a number of students
4. family, house, home
family家庭成员. My family is a happy one.
5. sound, voice, noise
noise噪音I hate the loud noise outside.
6. photo, picture, drawing
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，He has a large vocabulary.
8. population, people
population人口，人数，China has a large population.
9. weather, climate
climate长期的气候状况 The climate here is not good for you.
10. road, street, path, way
take this road; in the street, show me the way to the museum.
11. course, subject
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
cause 指造成某一事实或现象的直接原因，后接of sth./doing sth，
reason用来解释某种现象或结果的理由，后接for sth./doing sth. the reason for being late
14. exercise, exercises, practice
exercises练习(可数)，practice(反复做的)练习 Practice makes perfect.
15. class, lesson
作"课"解时,两者可以替换.指课文用lesson. 指班级或全体学生用class.
16. speech, talk, lecture
speech指在公共场所所做的经过准备的较正式的演说，
lecture学术性的演讲，讲课 a series of lecture on…
17. officer, official
official政府官员 an army officer
18. work, job
二者均指工作。work不可数，job可数 a good job
19. couple, pair
pair多指由两部分组成的东西 a pair of trousers
20. country, nation, state, land
nation指人民，国民，民族，The whole nation was sad at the news
21. cook, cooker
cook厨师，cooker厨具 He is a good cook.
22. damage, damages
damages复数形式, 赔偿金 $900 damages
23. police, policeman
The police are questioning everyone in the house.
24. problem, question
problem常和困难;联系，前面的动词常为think about, solve, raise，
question常和疑问联系，多和ask, answer连用
25. man, a man
man人类，a man一个男人 Man will conquer nature.
26. chick, chicken
二者均可指小鸡，chicken还可以当鸡肉 The chicken is delicious.
27. telegram, telegraph
当电报解时，telegram指具体的，telegraph指抽象的 a telegram, by telegraph
28. trip, journey, travel, voyage
trip指短期的旅途，a three-day trip
29. sport, game
sport多指户外的游戏或娱乐活动，如打球，游泳，打猎，赛马等;
game指决定胜负的游戏，通常有一套规则 His favorite sport is swimming.
30. price, prize
prize奖，奖品，奖金 win the first prize The price is high/low.
