What does oil(lipid) mean?

lip·id
ˈlipid/
noun Chemistry
noun: lipid; plural noun: lipids

any of a class of organic compounds that are fatty acids or their derivatives and are insoluble in water but soluble in organic solvents. They include many natural oils, waxes, and steroids.
google.com

An oil is any neutral, nonpolar chemical substance that is a viscous liquid at ambient ... The general definition of oil includes classes of chemical compounds that may be otherwise unrelated in structure, properties, and uses.
en.wikipedia.org/wiki/Oil

Summary: A lipid is carbon based. An oil may be based on other elements.