Check out this post from the Libro Editing blog that helps us decide between using arc or arch?
An arc is first of all a curve that is made up of part of the circumference of a circle. So it has a particular form which may well be like that of an arch, but it’s always part of that circumference in this case. It can also be the electrical discharge that jumps from one point to another (so lightning forms an arc: not in this case a nice tidy bit out of a circumference) and finally we have the metaphorical use in a “story arc” in a fiction book, film, TV series or play (often across several episodes of a TV series) which traces the development of a plot or side plot. The verb to arc means to move with a curving trajectory, which could include arching over something.
An arch is a physical…
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