| JACCHUSES | • jacchuses n. Plural of jacchus. • JACCHUS n. a South American marmoset. |
| JEHADISMS | • JEHADISM n. promotion of jehad, also JIHADISM. |
| JEHADISTS | • jehadists n. Plural of jehadist. • JEHADIST n. one who takes part in a jehad, also JEHADI, JIHADI, JIHADIST. |
| JOBSHARES | • jobshares n. Plural of jobshare. • JOBSHARE n. the practice of dividing one job between two. |
| JACKFISHES | • jackfishes n. Plural of jackfish. • JACKFISH n. a food fish. |
| JADISHNESS | • jadishness n. The quality of being jadish. • JADISHNESS n. the state of being jaded. |
| JAILHOUSES | • jailhouses n. Plural of jailhouse. • JAILHOUSE n. a prison. |
| JOHANNESES | • johanneses n. Plural of johannes. • JOHANNES n. an obsolete Portuguese gold coin, named from the figure of King John which it bears, also JOANNES. |
| JAWCRUSHERS | • JAWCRUSHER n. a heavy-duty rock-breaking machine with hinged jaws. |
| JADISHNESSES | • JADISHNESS n. the state of being jaded. |
| JEALOUSHOODS | • JEALOUSHOOD n. (Shakespeare) jealousy. |
| SERJEANTSHIP | • serjeantship n. Obsolete form of sergeantship. • SERJEANTSHIP n. the office of serjeant. |
| HOJATOLESLAMS | • hojatoleslams n. Plural of hojatoleslam. • HOJATOLESLAM n. an Iranian cleric below the rank of ayatollah, also HOJATOLISLAM. |
| SERJEANTSHIPS | • serjeantships n. Plural of serjeantship. • SERJEANTSHIP n. the office of serjeant. |
| JOHNSONGRASSES | • johnsongrasses n. Plural of johnsongrass. • Johnson␣grasses n. Plural of Johnson grass. • JOHNSONGRASS n. a tall perennial sorghum widely used as forage. |
| STRAIGHTJACKETS | • STRAIGHTJACKET n. a straitjacket. |
| ZINJANTHROPUSES | • ZINJANTHROPUS n. a type of australopithecine, remains of which were discovered in the Olduvai Gorge in Tanzania in 1959. |