Idk if there's a suggestion page lol I'm new here, and I'm only fairly sure that there's no assonance feature, at least nothing on the drop down (check image link).
But I think that assonance would be an extremely useful feature, and I'm no programming expert but from what I've seen online it shouldn't be *too* difficult, considering this already has a massive database of rhymes idk man. Still I think Rhymezone is a great tool to use, but an assonance tool would make it better.