Optional extra
Subordinate and optional extra are semantically related. In some cases you can use "Subordinate" instead a noun phrase "Optional extra".
Subordinate
Subordinate noun - One who is of lower rank and typically under the authority of another.
Optional extra and subordinate are semantically related. You can use "Optional extra" instead a noun "Subordinate".
Cite this Source
Subordinate and Optional extra. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/optional_extra/subordinate
Optional extra & Subordinate. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/optional_extra/subordinate>.
Subordinate or Optional extra. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/optional_extra/subordinate.
Google Ngram Viewer shows how "optional extra" and "subordinate" have occurred on timeline