Extension and Supplemental

Extension noun - The act of making longer.

Supplemental and extension are semantically related in special topic. In some cases you can use "Supplemental" instead a noun "Extension".

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

Supplemental adjective - Available to supply something extra when needed.

Extension and supplemental are semantically related in special topic. Sometimes you can use "Extension" instead a noun "Supplemental".

Nearby Words: supplement, supplementary, supplemented, supplementing, supplementation