curvilinear vs curvilineal

curvilinear and curvilineal both are adjectives.

Word	Noun	Adjective	Verb	Adverb
curvilinear	No	Yes	No	No
curvilineal	No	Yes	No	No

As adjectives, curvilinear and curvilineal are synonyms defined as:

curvilinear and curvilineal: characterized by or following a curved line

curvilinear (adjective)	curvilineal (adjective)
characterized by or following a curved line	characterized by or following a curved line