pubic region vs loins

pubic region and loins both are nouns.

Word	Noun	Adjective	Verb	Adverb
pubic region	Yes	No	No	No
loins	Yes	No	No	No

As nouns, pubic region and loins are synonyms defined as:

pubic region and loins: the lower part of the abdomen just above the external genital organs

Other synonyms of pubic region include pubes.

pubic region (noun)	loins (noun)
the lower part of the abdomen just above the external genital organs	the lower part of the abdomen just above the external genital organs
	the region of the hips and groin and lower abdomen