Border and Lip

Border noun - The line or relatively narrow space that marks the outer limit of something.

Lip is a synonym for border in margin topic. In some cases you can use "Lip" instead a noun "Border", when it comes to topics like edge.

Nearby Words: borderline, bordered, bordering, borderland, borderless

Lip noun - Either the outer margin or the inner margin of the aperture of a gastropod's shell.

Border is a synonym for lip in edge topic. You can use "Border" instead a noun "Lip".