Domains with 'wordpress' in it

Hey all,

I recently wondered if it’s allowed to register domains with the name ‘wordpress’ in it? Like when I register something like ‘convert-psd-to-wordpress.com’ or something similar, and let people pay me to convert their PSD to wordpress, is it allowed? And would it (if its allowed) still be allowed when i register it was a company?

Kind regards,

Robin