Sui generis
In local government, a "sui generis" entity is one that does not fit with the general scheme of local governance of a country. For example in England, the City of London and the Isles of Scilly are the two "sui generis" localities, as their forms of local government are both (for historical or geographical reasons) very different from those of elsewhere in the country. 
In a press conference during which reporters were trying to analyse his political personality, Huey Long said, "...say that I am "sui generus", and let it go at that."
Gender
The modern English word "gender" comes from the Middle English "gender", "gendre", a loanword from Anglo-Norman and Middle French "gendre". This, in turn, came from Latin "genus". Both words mean "kind", "type", or "sort". They derive ultimately from a widely attested Proto-Indo-European (PIE) root "gn-",
which is also the source of "kin", "kind", "king", and many other English words. It appears in Modern French in the word "genre" (type, kind, also "") and is related to the Greek root "gen-" (to produce), appearing in "gene", "genesis", and "oxygen". The Oxford Etymological Dictionary of the English Language of 1882 defined "gender" as "kind, breed, sex", derived from the Latin ablative case of "genus", like "genere natus", which refers to birth. The first edition of the Oxford English Dictionary (OED1, Volume 4, 1900) notes the original meaning of "gender" as "kind" had already become obsolete.