First and Highest

First

First adjective - Coming before all others in importance.
Usage example: there are a number of reasons we can't go, but the first is that we don't have the money

Highest is a synonym for first in foremost topic. In some cases you can use "Highest" instead an adjective "First", when it comes to topics like principal.

Nearby Word: firstly

Highest

Highest adjective - Being at a point or level higher than all others.
Usage example: the highest flag on the pole

First is a synonym for highest in principal topic. You can use "First" instead an adjective "Highest".
Cite this Source
Highest and First. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/first/highest
First & Highest. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/first/highest>.
Highest or First. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/first/highest.
Google Ngram Viewer shows how "first" and "highest" have occurred on timeline