5. sound, voice, noise

sound自然界各種各樣的聲音;
voice人的嗓音;
noise噪音 eg:I hate the loud noise outside.

6. photo, picture, drawing

photo用照相機(jī)拍攝的照片;
picture可指相片，圖片，電影片;
drawing畫的畫 eg:Let's go and see a good picture.

7. vocabulary, word

vocabulary詞匯，一個(gè)人擁有的單詞量;
word具體的單詞 eg:He has a large vocabulary.

8. population, people

population人口，人數(shù);
people具體的人 eg:China has a large population.