Highest
Highest adjective - Being at a point or level higher than all others.
Usage example: the highest flag on the pole
Upper
Upper adjective - Higher in place or position.
Mutual synonyms
Both words in one sentence
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Upper-Class Twit: Level 5 tenants (the highest level), particularly the horse-faced, buck-teethed, boater hat-wearing Sloanes.
Source: Video Game / Constructor - The German and the Austrian professional/upper-middle classes (the highest class of society besides the gentry and the industrialists) had a disproportionally high proportion of Jews, which antisemites tended to exaggerate long before World War I.
Source: Analysis / Nazi Nobleman -
Kick the Dog: The upper levels of the Game Station are the higher priority for the Daleks, as the Doctor is on the highest floor working on a plan that could destroy the Dalek army.
Cite this Source
Upper and Highest. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/highest/upper
Highest & Upper. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/highest/upper>.
Upper or Highest. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/highest/upper.
Google Ngram Viewer shows how "highest" and "upper" have occurred on timeline