That's this week's theme, tg. Words that look like something they ain't.

sextet - nothing to do with sex.

potatory - nothing to do with potatoes.

gyrovague - nothing to do with gyroscopes (or gyros for that matter) or vagueness.

discommode - nothing to do with the potty.

and

obsequy - nothing to do with obsequiousness.

Well, except the last three anyway seemed to have some etymological relation.