Allow
Allow verb - To give permission for or to approve of.
Flown
Both words in one sentence
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The toroidal aerospike rockets that allow the landers Orpheus and Ares to descend to and take off from Venus and Mars respectively - aerospike engines have undergone testing and a linear aerospike was even proposed for the Space Shuttle, but none have been flown into space,.
Cite this Source
Flown and Allow. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/allow/flown
Allow & Flown. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/allow/flown>.
Flown or Allow. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/allow/flown.
Google Ngram Viewer shows how "allow" and "flown" have occurred on timeline