STRAIGHT LINE LETTERS ONLY (AEFHIKLMNTVWXYZ)
Longest word made from straight line letters: possibly METHYLHEXANEAMINE (Dorland's Medical Dictionary). (ZENZIZENZIZENZIc and sym-METHYLETHYLETHYLENE have straight line strings of 15, 19 letters.)
Longest straight line letter heterogram: several, including WILKHAVEN and WYKHAMITE, have 9 letters
Word Ways: Vol. 32
, Article 5.
Available at: https://digitalcommons.butler.edu/wordways/vol32/iss4/5