Here You could find all types of Homonyms to clarify your doubt.
1. A heavy twilled cotton cloth. Especially denim
2. A pair of jeans
Gene: (Biology) A hereditary unit that is transferred from parent to offspring and which determines the characteristics of the offspring, particularly a distinct sequence of DNA forming part of chromosomes
Jack: An English or Christian name
1. A device used for lifting heavy objects, especially one for raising the axle of a motor vehicle
2. Playing card bearing an image of soldier, page or knave and normally ranking below the queen