hard coal hard clam • hard-coated · · · Info · Definitions · Synonyms · Characters · · hard coal · · Text Common · · Latin · · Scripts 9 · · Length 3 · · Syllables Definitions · · · (noun) a hard natural coal that burns slowly and gives intense heat. Synonyms: anthracite, anthracite coal, hard coal. · · Noun Definition 1 Synonyms · · · anthracite · · Synonym 1 anthracite coal · · Synonym 2 Characters · · space U+0020 a latin small letter a U+0061 c latin small letter c U+0063 d latin small letter d U+0064 h latin small letter h U+0068 l latin small letter l U+006C o latin small letter o U+006F r latin small letter r U+0072