Background
Background noun - The physical conditions or features that form the setting against which something is viewed.
Mass and background are semantically related. In some cases you can use "Mass" instead a noun "Background".
Mass
Mass noun - A considerable amount.
Background and mass are semantically related. Sometimes you can use "Background" instead a noun "Mass".
How words are described
Both words in one sentence
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In the Manga, it's not as readily apparent because of the pacing, but once Sekirei with numbers begin appearing in mass and the background info picks up, it's not a difficult concept.
Source: Manga / Sekirei -
As with the background ponies list, this section are for recurring fanon relationships within the fandom that, as of yet, have not reached critical mass to require its own stand alone section.
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Mass Effect characters, for the most part, have a neck cover to hide the fact that the background NPC's are just head-swaps with an occasional change in skin color.
Source: Ring Around the Collar
Cite this Source
Mass and Background. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/background/mass
Background & Mass. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/background/mass>.
Mass or Background. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/background/mass.
Google Ngram Viewer shows how "background" and "mass" have occurred on timeline