'Book' is a noun or verb?

'Book' can be used as a verb or a noun.

Example of noun:
She has written several books (n) on the subject.
His name is no longer on our books (n).

Example of verb:
Mary has booked (v) a flight from New York to London.
The cop booked (v) John on a charge of speeding.

Hope I can help you.

n.[C]
1. 書,書本,書籍;著作;報章雜誌
She has written several books on the subject.
她已經寫了幾部有關這方面的書了。
2. 本子;簿冊;支票簿
3. 帳冊;名冊[P][K]
His name is no longer on our books.
他的名字從我們的名冊上勾銷了。
4. (長篇作品的)卷,篇,部
5. 裝訂成書本形的同類物品
6. (輕鬆音樂劇的)歌詞;(戲劇的)腳本
7. 課業;功課[the P]
8. 賭注登錄[P]
9. 電話號碼簿[the S]
vt.
1. 預訂;預雇;預約
Mary has booked a flight from New York to London.
瑪麗已預訂了從紐約到倫敦的飛機票。
2. (警方)將...登記入冊以作指控之用
The cop booked John on a charge of speeding.
警察指控約翰超速駕駛。
3. 登記
4. 為...登錄賭注
vi.
1. 預訂
2. 【英】(旅客)登記住入旅館

Book can be in noun and verb

'Book' can either be a noun or verb:

e.g. This book is mine (noun) 書本
e.g. He had booked a personal loan from HK Bank (verb) 預訂

"book;can be a noun or a verb
睇下用係where!

"book" can be a noun or a verb
need to see the whole sentence structure in order to decide bor ...