Student or Learner
Why do we have at before doughnut?
not a teacher
It says "donut, at doughnut" on the "See all results" page because it's directing you to where the form "donut" is defined on the "doughnut" page.
In other words: ""donut" is defined at the entry for "doughnut".
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.
And that they don't sell "Donut's"
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.