Search Suggestions are popular search queries that pop up under the search bar as you start typing your seed keyword on Google.
The Only Questions filter returns search suggestions that contain question words. These are questions asked by searchers on Google. Additionally, Serpstat arranges them in groups based on question words.
There are a few export options for search suggestions:
a) exporting all search suggestions;
b) exporting individual groups of search suggestions that contain a particular question word;
c) entering a list of of words in the filter box and exporting only those search suggestions that contain your seed words.