A good website for synonyms and antonyms would be www.synonym.com
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go on www.synonym.com 4 synonyms & antonyms
there is no synonyms or antonyms for convection current
they are closer to synonyms than antonyms, although they are not direct synonyms.
Antonyms. Antonyms = Opposites Synonyms = Same Meaning
Case and fancy are neither synonyms or antonyms.