Dis vs. diss
The wors meaning to disrespect or an instance of disrespect is spelled both ways.
Dampen, damper, dampener
Damper = (1) something that deadens, restrains, or depresses, (2) an adjustable plate for controlling a draft, and (3) one that deadens vibrations. Dampen = (1) to deaden sound, and (2) to make slightly wet. Dampener = something that dampens.
Coming Down the Pike vs. Coming Down the Pipe
Down the pike is the original, but both forms are widely used and understood.
Double vs. redouble
Double = to make something twice as great. Redouble = (1) to double something again, or (2) to make something much greater (as opposed to just twice as great).
Dialectal vs. dialectical
Dialectal corresponds to dialect. Dialectical is a less common variant of dialectic.
Dike or Dyke – What’s the Difference?
Dike is the American and Canadian spelling. Dyke is preferred outside North America. They share all their definitions.
Disc vs. disk
Disk refers to computer hardware. Discrefers to phonograph records, albums, and components of plows and brakd systems. In all other uses, the two spellings are interchangeable.
Divers vs. diverse
Divers = (archaic) various or many. Diverse = having great variety.