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Sir,

As we write "post office" using two words "post" and "office".

Can we write "postcard" or "post card"?

"speedpost" or "speed post"

Thanks.
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Do you mean "express" by "speed post"?

express: a rapid, efficient system for the delivery of goods and mail.
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SpeedPost seems to be a courier service. They complete your every delivery requirement, but are somewhat erratic in styling their own name:

SpeedPost, Speedpost, Speed Post.

MrP
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Comments  
'Post office' is two words.

'Postcard' is one word, short form of 'postal card' (two words).

I am not familiar with 'speed post'.
The spelling check of Word doesn't recognize 'speedpost', but it does recognize 'speed post'.
 paco2004's reply was promoted to an answer.
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 MrPedantic's reply was promoted to an answer.
Hello MR.Pedantic,

You have correctly guessed it.

"SpeedPost seems to be a courier service. They complete your every delivery requirement."

This is a courier service in India but mostly taken care by Post offices(a government organization).The term "speed post" used only post offices. The private companies which provide such facility called it a courier service.They never use "speed post".

When we have to send a letter to a distance place quickly, we go to a post office and do the procedure for speed post. Otherwise, for a simple letter we just drop it in a postbox nearby.

Thanks.