When I have grown parsnip, the root is wider at the top and tapers, rather than being irregular like the one in the picture above. Parsnips have a distinct aroma and the leaflets are a different shape than carrots although both have an umbel shaped flower.
Hemlock is toxic and deadly. it apparently does look similar to wild carrot and people have died from eating it. So my advice is DO NOT EAT THAT ROOT!!