Jonin

Jonin (literally "Higher Ninja", Viz "Jōnin" and "Elite Ninja") are generally highly-experienced ninja with great individual skill who serve as military captains. They are often sent on A-rank missions, and experienced Jonin, like Kakashi Hatake, may even be sent on S-rank missions (which are considered to be the most difficult), and may carry out missions alone. They are sometimes assigned as sensei for three-person teams of Genin. Most Jonin are able to use two or more types of elemental chakra. Though it is as yet unknown what one has to undergo to become a Jonin, it is mentioned in the Naruto Anime Profiles that Jonin are appointed.
Tokubetsu Jonin (Tokubetsu Jōnin?, literally "Special Higher Ninja" English "Special Jonin", sometimes known as Tokujō for short) are ninja who, rather than all-around Jonin training, have Jonin-level ability in a single area or skill, much like warrant officers of real-world militaries (e.g. Ibiki, who specializes in interrogation). They are elite specialists in their areas and are often assigned as subordinates to regular Jonin when their services are needed. They sometimes are seen as lower ranked than Jonin because they are good or the best in one field and they lack talent, or even ability in others.