==> language/english/spelling/operations.on.words/words.within.words.s <==
   longest non-trivial charade  IN-DISC-RIM-IN-A-TI-ON (16)
    longest forward and reverse charade 
     MAT-HE-MA-TI-CAL, LAC-IT-AM-EH-TAM 
   longest snowball or rhopalic  T-EM-PER-AMEN-TALLY (15)
   longest reverse rhopalic  HETERO-TRANS-PLAN-TAT-IO-N (21)
   highest ratio of subwords/length (logogram) 
    FIRESTONE: RE, TO, ON, NO, IF, FIR, IRE, RES, TON, ONE, NOT, RIF, FIRE,
    IRES, REST, TONE, FIRES, STONE, SERIF (20/9)
   longest charlinkade  FORESTALL: FOREST, ALL; FORE, REST, TALL (9)
   longest alternade  TRIENNIALLY: TINILY, RENAL (11)
   shortest three-letter-minimum word deletions 
    PILGRIMAGE: RIM, GAG, PILE; GRIM, LAG, PIE 
****
Unless noted otherwise, all words occur in Webster's Third New International
Dictionary, Merriam-Webster, Springfield, MA, 1961.