Most important
Relevant and most important are semantically related. in valuable topic. In some cases you can use "Relevant" instead an adjective phrase "Most important".
Relevant
Relevant adjective - Having to do with the matter at hand.
Most important and relevant are semantically related. Sometimes you can replace phrase "Most important" with "Relevant", this terms are similar.
Mutual synonyms
Both terms in one sentence
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His most important achievement would probably be the addition of the wild card (and later, the second wild card), which increases overall fan interest by keeping many teams relevant much later into the season than they normally would be.
Source: Useful Notes / Baseball - In Tsubasa Reservoir Chronicle, the eponymous reservoir, while it appears halfway through the story, does not seem relevant until the final arc, where a flashback and a reveal make it retroactively the most important location in quite possibly the entire CLAMP multiverse.
Source: Chekhovs Gun / Anime and Manga
Cite this Source
Relevant and Most important. (2016). Retrieved 2026, August 07, from https://thesaurus.plus/related/most_important/relevant
Most important & Relevant. N.p., 2016. Web. 07 Aug. 2026. <https://thesaurus.plus/related/most_important/relevant>.
Relevant or Most important. 2016. Accessed August 07, 2026. https://thesaurus.plus/related/most_important/relevant.
Google Ngram Viewer shows how "most important" and "relevant" have occurred on timeline