groin vs loins

groin and loins both are nouns.

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

groin (noun)	loins (noun)
a protective structure of stone or concrete; extends from shore into the water to prevent a beach from washing away	the lower part of the abdomen just above the external genital organs
a curved edge formed by two intersecting vaults	the region of the hips and groin and lower abdomen
the crease at the junction of the inner part of the thigh with the trunk together with the adjacent region and often including the external genitals

groin (verb)	loins (verb)
build with groins