- Any of various units of matter below the size of an atom, including the elementary particles and hadrons.亚原子粒子：尺寸小于原子的各种物质单位之任何一种，包括基本粒子及强子
- junior
- junior bantamweight
- junior college
- junior featherweight
- junior flyweight
- junior heavyweight
- junior high
- junior high school
- junior lightweight
- junior middleweight
- junior miss
- juniors
- junior varsity
- junior welterweight
- juniper
- juniper oil
- junipers
- juniper tar
- juniper–berry oil
- junk
- junk
- junk art
- junk bond
- junk DNA
- junked