loins vs pubic region

loins and pubic region both are nouns.

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

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

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

Other synonyms of loins include pubes.

loins (noun)	pubic region (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