On what
Upon which and on what are semantically related in on which topic. In some cases you can use "Upon which" instead an adverb phrase "On what".
Upon which
On what and upon which are semantically related in on which topic. You can use "On what" instead an adverb phrase "Upon which".
Mutual synonyms
Cite this Source
Upon which and On what. (2016). Retrieved 2026, July 29, from https://thesaurus.plus/related/on_what/upon_which
On what & Upon which. N.p., 2016. Web. 29 Jul. 2026. <https://thesaurus.plus/related/on_what/upon_which>.
Upon which or On what. 2016. Accessed July 29, 2026. https://thesaurus.plus/related/on_what/upon_which.
Google Ngram Viewer shows how "on what" and "upon which" have occurred on timeline