category of English

I know :

a. read, eat, walk are verbs

b. cup, ruler, pen are objects
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What do we call :

1. what, where, who

2. I
we

3. you
you

4. he, she, it
they

5. day
date
week
month
year

6. yesterday
today
tomorrow

7. Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday

8. Janunary
Februray......December

9. O' clock
Second
minute
hour

10. one
two
three.................etc

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ju

All the parts of the speech are described here: The Parts of Speech

Click on the "what is a ...?" links on the left side menu.

Also, if you look up a word in a dictionary, you'll find that the entry will list what part of the speech the word is. Often the same word can belong to different categories, depending on how it's used (ex. walk can be a noun).