Do you say ‘dash’ or ‘hyphen’ when dictate a web address? For example, how would you read english-test.net? Is it ‘english dash test dot net’ or ‘english hyphen test dot net’?
What do you mean by “underline” word? Maybe you are talking about the ‘underscore’? But an underscore can’t be part of a web address. You can use the underscore only in the first part of an email address.
For example, this is what your email address can look like:
Hyphens are used for compounding words or separating syllables, and not much else.
The dash has several different variants, one of which, the em dash (so called because it’s the width of the letter ‘m’ in a given font’) can be used similar to an ellipses (…) to indicate an unfinished thought, and it can also be used similar to a colon or parenthesis to indicate an abrupt change in thought or as an end stop somewhat weaker than a period, but stronger than a comma.
There are a whole slug of nitpicky rules of style that govern the usages of the different types of dash, and the uses differ between the major style sources.
So, I guess technically, it should be “English hyphen test dot net”.
However, some argue for a en dash (shorter than em dash) in certain compoundings, so there’s room to argue “English dash test dot net.” :?