Principal
Uppermost
Uppermost adjective - Being at a point or level higher than all others.
Usage example: the uppermost floor of the house gets very hot in the summer
Principal is a synonym for uppermost in chief topic. You can use "Principal" instead an adjective "Uppermost", if it concerns topics such as predominant.
Mutual synonyms
Cite this Source
Uppermost and Principal. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/principal/uppermost
Principal & Uppermost. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/principal/uppermost>.
Uppermost or Principal. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/principal/uppermost.
Google Ngram Viewer shows how "principal" and "uppermost" have occurred on timeline