musculus sphincter urethrae vs urethral sphincter

musculus sphincter urethrae and urethral sphincter both are nouns.

Word	Noun	Adjective	Verb	Adverb
musculus sphincter urethrae	Yes	No	No	No
urethral sphincter	Yes	No	No	No

As nouns, musculus sphincter urethrae and urethral sphincter are synonyms defined as:

musculus sphincter urethrae and urethral sphincter: a striated sphincter muscle that constricts the urethra

musculus sphincter urethrae (noun)	urethral sphincter (noun)
a striated sphincter muscle that constricts the urethra	a striated sphincter muscle that constricts the urethra