References in periodicals archive ?
For single-letter symbols, I am unable to find anything longer than Ed Wolpow's PSYCHOPANNYCHY [1], though for the case where repeated symbols are forbidden I can offer the 8-letter WICKYUPS, UNBISHOP, CUSHIONY, CHIBOUKS, and BOYCHIKS.
Q1: BIOPSY, BOUNCY, COUSIN, FUSION, SPUNKY and UNPICKS are among the common six-letter words with no repeated letters, though the longest seems to be the eight-letter WICKYUPS, courtesy of Webster's Second.