Vocabulary is a collection of words or terms used in a language. In English, vocabulary includes all the words in that language, such as nouns, verbs, adjectives, adverbs, and so on. Vocabulary can be used to communicate well in English, both orally and in writing. It is important for English learners to learn and develop their vocabulary in order to be able to communicate effectively with native English speakers.

Here are some examples of frequently used English vocabulary:

1. Hello - Hello
2. Goodbye - Goodbye
3. Thank you - Thank you
4. Please - Please
5. Sorry - Sorry
6. Yes - Yes
7. No - No
8. Help - Help
9. Friends - Friends
10. Family - Family
11. Love - Love
12. Happy - Happy
13. Sad - Sad
14. Angry - Angry
15. Beautiful - Beautiful
16. Ugly - Ugly
17. Big - Big
18. Small - Small
19. Hot - Hot
20. Cold - Cold

Of course, these are just a few examples of vocabulary in English. There are thousands of other words that can be learned and used in English.