Back-up
Sub and back-up are semantically related. in possible choice topic. In some cases you can use "Sub" instead a noun phrase "Back-up".
Sub
Mutual synonyms
Both words in one sentence
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He is the villain of the back-up stories in Justice League.Adam is something of an alternate company equivalent to Namor the Sub-Mariner, the Marvel Universe's own super strong, pointy eared, black hair slick backed, anti-hero flyer.
Source: Comic Book / Black Adam
Cite this Source
Sub and Back-up. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/back-up/sub
Back-up & Sub. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/back-up/sub>.
Sub or Back-up. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/back-up/sub.