"Web design" vs. "webdesign"
Suppose I want to use the word in a company's name, for example:
- ABC Web Design
- ABC Webdesign
Which one is correct? Should it be one word or two?
There doesn't seem to be much of a consensus for which is proper, but looking on the Internet, it seems that Web Design would be a better choice. According to this source (albeit written in 2011) shows that Web Design is the more popular word for search engines. In this digital age, SEO (Search Engine Optimization) is very important for a company. Using Web Design would yield more potential customers.
EDIT: I used Google's Ngram using the terms. As you can see, Web Design is overwhelmingly more popular than webdesign.
'Webdesign' is not a word
You should use the form ABC Web Design. Webdesign is merely a concatenation of two words: 'web' and 'design'.
'Webdesign' is not a word. Dictionary.com does not have this word in their database and a search on Google returns only German words. By using the form 'webdesign' the number of visitors coming to your website from a search engine will drop as the majority of people search for web design.
By all means, use ABC Web Design.