Grep two words with exact match

Shell Programming and Scripting
1

HI

Input :

Counters
Counter                                                     
Int                           
Ints    
Counters
Counters
Ints
Ints

I want to grep Counter|Int

Output :

Counter 
Int
2

I do see blank spaces after those string, so you could do:

grep -E "^Counter[ ]*$|^Int[ ]*$" file