Covering
Flap
Flap noun - Any broad, thin, and limber covering attached at one edge; hangs loose or projects freely.
Usage example: he wrote on the flap of the envelope
Covering and flap are semantically related in cover topic. Sometimes you can use "Covering" instead a noun "Flap", if it concerns topics such as fold.
Cite this Source
Flap and Covering. (2016). Retrieved 2026, August 07, from https://thesaurus.plus/related/covering/flap
Covering & Flap. N.p., 2016. Web. 07 Aug. 2026. <https://thesaurus.plus/related/covering/flap>.
Flap or Covering. 2016. Accessed August 07, 2026. https://thesaurus.plus/related/covering/flap.
Google Ngram Viewer shows how "covering" and "flap" have occurred on timeline