pubes vs loins

pubes and loins both are nouns.

Word	Noun	Adjective	Verb	Adverb
pubes	Yes	No	No	No
loins	Yes	No	No	No

As nouns, pubes and loins are synonyms defined as:

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

Other synonyms of pubes include pubic region.

pubes (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