Drama
— Drama can be both super serious or pretty funny, but regardless it follows a mostly straightforward plot with mostly straightforward characters. It can include historical, romance, mystery, coming-of-age, etc.
Stock
— Stock can also be both super serious or pretty funny, but mostly played straight plus more action and/or edge. It can include crime, western, war, spy/hero, etc. (“Stock” comes from gun-stock, which is usually present here).
Farce
— Farce is usually funnier, but can also be less so in darker or more sardonic stories. Either way, a thing is farce in that it has a more absurd plot with stranger or sillier characters. It can include screwball, romance, musical, satire, etc.
Freak
— Freak is usually darker or sardonic but can be funny. Like farce, it has a more absurd plot with stranger or sillier characters, plus more scares and/or discomfort. It can include horror, thriller, slasher/pulp, satire, etc.
Stunt
— Stunt encompasses films with heavy fantasy or science fiction; talking animals/objects; stupid action, like skyscrapers crumbling; or stories of times so ancient they feel like fantasy. It could be further divided into tonal forms like the above, however, because stunt films are usually larger in scope (and so production scale), there are fewer of them made. So, for the Top 50 rankings they fall under one label, unifying them as not (or the least) “standard” in story or scope.