obstetric vs obstetrical

obstetric and obstetrical both are adjectives.

Word	Noun	Adjective	Verb	Adverb
obstetric	No	Yes	No	No
obstetrical	No	Yes	No	No

As adjectives, obstetric and obstetrical are synonyms defined as:

obstetric and obstetrical: of or relating to or used in or practicing obstetrics

obstetric (adjective)	obstetrical (adjective)
of or relating to or used in or practicing obstetrics	of or relating to or used in or practicing obstetrics