venae labiales posteriores vs posterior labial veins

venae labiales posteriores and posterior labial veins both are nouns.

Word	Noun	Adjective	Verb	Adverb
venae labiales posteriores	Yes	No	No	No
posterior labial veins	Yes	No	No	No

As nouns, venae labiales posteriores and posterior labial veins are synonyms defined as:

venae labiales posteriores and posterior labial veins: veins that pass posterior from the labia majora to the internal pudendal vein

venae labiales posteriores (noun)	posterior labial veins (noun)
veins that pass posterior from the labia majora to the internal pudendal vein	veins that pass posterior from the labia majora to the internal pudendal vein