Gotcha!

Recently, the final step in an online form required me to type the answer to this Captcha:

What is the first word in the phrase "gadux usu lihab cutagu ofuza"?

Feeling like I’d stumbled into an anagram from NPR’s Sunday Puzzle, I searched for an English word hidden amid the letters and spaces. When I was unsuccessful after a minute, I wondered if I was over-thinking the matter. Wasn’t a “word” simply one or more letters, grouped together?

I entered “gadux” and the website was happy.