Is that word Feminine or Masculine?

Retina, 26 bytes (sets 4, 5)

[^u]es|ee|m.i|y|^...c|d.*a

Retina is @MartinBüttner's regex language. I haven't used anything specific to .NET regexes, so you can test the regex at Regex101 here. Alternatively you can use Retina's grep G mode like so:

G`[^u]es|ee|m.i|y|^...c|d.*a

and pipe in a file with one word per line for batch testing.

Retina outputs the number of matches by default, giving us our truthy/falsy value. The rule "the values don't all have to be the same truthy/falsy type" is pretty important though since marchioness matches twice, giving an output of 2.

_{(Using the mod-chaining method from the previous male/female question seems to be shorter in CJam, but I'll let someone else do that)}

Retina, 39 32 bytes (sets 2, 4)

Accounting for marquess was annoying, since using ma was the best way to get some of the feminines.

[^u]es|ma$|mo|y|[mie]e|wi|ter|au

Try it here

Thanks to Sp3000 for his golf suggestion.

Retina, 28 bytes (sets 3,4)

w|[mhorse]e|[^u]es|duc|[dn]y

Retina uses .NET regex, but any flavor should work. Test it at Regex101.