crosshead vs crossheading

crosshead and crossheading both are nouns.

Word	Noun	Adjective	Verb	Adverb
crosshead	Yes	No	No	No
crossheading	Yes	No	No	No

As nouns, crosshead and crossheading are synonyms defined as:

crosshead and crossheading: a heading of a subsection printed within the body of the text

crosshead (noun)	crossheading (noun)
metal block that connects to a piston; it slides on parallel guides and moves a connecting rod back and forth	a heading of a subsection printed within the body of the text
a heading of a subsection printed within the body of the text