So, linguistic typology (the method/field of systematic cross-linguistic comparison) is sorta a combination of this
In order to share this joy/pain with the world we have a series of post on Free Online Linguists Databases where we try and recommend a few, provide some background to them and some advice on how to use them. We made a list of the ones done so far, and the ones we'd like to write about in the future, looki-looki!
If you need help with linguistic terminology, we've compiled a list of places you can turn and problems you might want to be aware of.
Do tell us if we're missing something or if there's a term you don't understand :)!
And always remember: read their definitions carefully before questioning the coding of a feature in a specific language, if problem still remains or definition is non-existent: then email the editors.