Constitutional
Constitutional adjective - Being a part of the innermost nature of a person or thing.
Key and constitutional are semantically related. In some cases you can use "Key" instead an adjective "Constitutional".
Key
Key adjective - Coming before all others in importance.
Constitutional and key are semantically related. Sometimes you can use "Constitutional" instead an adjective "Key".
Mutual synonyms
Both words in one sentence
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The real Dickinson served with distinction and returned to play a key role in the Constitutional Convention.
Source: Theatre / 1776 - While the *USA is a de jure constitutional federation, it is unfortunately, in all reality, largely controlled by horribly immoral wealthy planters and unscrupulous industrialists; both of these elite groups, btw, were the key to the ultimate preservation of U.S. slavery.
Source: Literature / Decades of Darkness -
However, courts have held that even homeless people squatting in public parks have the constitutional right against unreasonable searches and seizures-the key is whether it can be considered their "house", even if they're squatting there, so that part is unclear.
Source: Film / Dirty Harry
Cite this Source
Key and Constitutional. (2016). Retrieved 2026, August 03, from https://thesaurus.plus/related/constitutional/key
Constitutional & Key. N.p., 2016. Web. 03 Aug. 2026. <https://thesaurus.plus/related/constitutional/key>.
Key or Constitutional. 2016. Accessed August 03, 2026. https://thesaurus.plus/related/constitutional/key.
Google Ngram Viewer shows how "constitutional" and "key" have occurred on timeline