KEY: Rectilinear.
SYN: Straight, undeviating, right-lined, point-blank.
ANT: Curvilinear, deflexed, winding, tortuous, curved, serpentine.

• Junction
• Juncture, [See CONJUNCTURE]
• Jungle
• Junior
• Jurisdiction
• Just
• justice
• Justification
• Justify
• Juvenile
• Juxtaposition
• Keep
• Keeper, [See KEEP]
• Keeping
• Keepsake
• Ken
• Kernel, [See CORK]
• Key
• Kick
• Kill
• Kin
• Kind
• Kind_\a
• Kindle
• Kind