Difference between Nether Region and Perineum

NETHER REGION vs PERINEUM: NOUN

The groin or buttocks.
A place which is subterranean or enclosed beneath a surface, especially one which is dark, dank, or otherwise inhospitable.
Hell; a realm beneath the surface of the earth conceived as the abode of the souls of the dead and, sometimes, as the abode of demons or evil spirits.
(Christianity) the abode of Satan and the forces of evil; where sinners suffer eternal punishment

Region between the genital area and the anus in both sexes.
The region which is included within the outlet of the pelvis, and is traversed by the urinogenital canal and the rectum.
The region included by the outlet of the pelvis, extending from the apex of the subpubic arch in front to the tip of the coccyx behind, and bounded laterally by the conjoined pubic and ischiatic rami, the tuberosities of the ischia, and the great sacrosciatic ligaments.
The region of the body between the thighs, extending from the anus to the fourchette in the female, or to the scrotum in the male.
The region between the scrotum and the anus in males, and between the posterior vulva junction and the anus in females.
The portion of the body in the pelvis occupied by urogenital passages and the rectum, bounded in front by the pubic arch, in the back by the coccyx, and laterally by part of the hipbone.
The general region between the anus and the genital organs

Penis, Craniums, Vagina, Clit, Glans, Derriere, Vulva, Anus, Crotch, Scrotum, The pit, Infernal region, Inferno, Perdition, Hell

Commissure, Inguinal canal, Frenulum, Spermatic cord, Gluteus maximus, Umbilicus, Glans penis, Pubic bone, Anus, Anal sphincter, Glans, Vulva, Vagina, Urethra, Lacerated

Outie, Cumming, Penis, Craniums, Vagina, Clit, Glans, Derriere, Vulva, Anus, Crotch, Scrotum, Inferno, Perdition, Hell

Commissure, Inguinal canal, Frenulum, Spermatic cord, Gluteus maximus, Umbilicus, Glans penis, Pubic bone, Anus, Anal sphincter, Glans, Vulva, Vagina, Urethra, Lacerated

Pants unbuttoned, zipper halfway down, Pink teases the audience with a flash of the uppermost portion of his hairy nether region.
When it comes to shaving your nether region, angles are everything.
So I am not blowing smoke up your nether region.

Complications aternal: lacerations to the vagina, cervix, perineum, and uterus.
Healing after childbirth often requires special care for the perineum.
Foreplay, Intercourse Well Suited For Stimulating: Clitoris, Testicles, Perineum, Nipples.
Burns to face, hands, feet, genitalia, perineum and major joints.
Lesions extended to the posterior fourchette, perineum, and anus.
Prep from neck to thigh with towel over perineum.
Asks the client to void and wash her perineum.
Formed stool is less likely to contaminate the perineum.
Normal distribution of hair on scalp and perineum.
Inspection and palpation of back, buttocks, perineum, groin.