Extension and Layby

Extension noun - The act of making longer.

Layby and extension are semantically related. In some cases you can replace term "Layby" with "Extension", this nouns are similar.

Nearby Words: extend, extended, extent, extensive, extensively

Layby noun - Designated paved area beside a main road where cars can stop temporarily.

Extension and layby are semantically related. You can use "Extension" instead a noun "Layby".