cross-section vs cross-sectional

cross-section and cross-sectional both are adjectives.

Word	Noun	Adjective	Verb	Adverb
cross-section	No	Yes	No	No
cross-sectional	No	Yes	No	No

As adjectives, cross-section and cross-sectional are synonyms defined as:

cross-section and cross-sectional: representing a plane made by cutting across something at right angles to its length

cross-section (adjective)	cross-sectional (adjective)
representing a plane made by cutting across something at right angles to its length	of or relating to a cross section
	representing a plane made by cutting across something at right angles to its length