Synonyms that are in the dictionary are marked in green. Synonyms that are not in the dictionary are marked in red.
Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.
However, there is another lesser-known contender in the aviation race that was designed by the U.S. military in conjunction with a company called Republic Aviation to serve as a faster-than-sound fighter jet.
Source: https://www.slashgear.com/1310785/xf-91-thunderceptor-jet/