The following is a list of terms and concepts related to New Japan Pro-Wrestling.
Ace (noun): An ace is the top star of a promotion or division. Very successful in the ring, they will often either hold the top championship or be consistently considered a contender for the top championship in their division. Aces are featured prominently in promotional materials and have found success over a long period of time, currying popularity with the fans.
Puro or Puroresu (noun): Among non-Japanese speakers, puro or puroresu refers specifically to Japanese professional wrestling. It can also be used to refernce a style of wrestling, however, as styles vary in Japanese pro-wrestling, this usage has little meaning.
Gaijin (noun): A gaijin is, loosely, any non-Japanese person. A more strict definition would be any non-east Asian person.
Stable (noun): A stable is a group of three or more wrestlers who have allied themselves both in and out of the ring. Stablemates will often corner each other in matches (and occassionally attempt to affect their outcomes of each others matches), as well as travel, train, and hang out together.
Young boy (noun): A young boy is a young Japanese pro-wrestler still in the training stages of their career. When not wrestling, young boys can be seen ringside assisting the veteran pro-wrestlers by holding the ropes, protecting the crowd, tending to pro-wrestlers after matches, etc. They typically can be indentified by their uniform warm-up gear. When young boys are called to wrestle, they are virtually always outmatched, rarely getting any meaningful offense during a match. At this stage of their career, showing determination and an unwillingness to quit against more skilled and experienced wrestlers is more important than victory. Young boys' ring gear are very simple (either black or solid colored tights, boots and kneepads) until they've earned the right to graduate into the next stage of their career.