gonad vs ballock

gonad and ballock both are nouns.

Word	Noun	Adjective	Verb	Adverb
gonad	Yes	No	No	No
ballock	Yes	No	No	No

As nouns, ballock is a hyponym of gonad; that is, ballock is a word with a more specific, narrower meaning than gonad:

gonad: a gland in which gametes (sex cells) are produced
ballock: one of the two male reproductive glands that produce spermatozoa and secrete androgens

Other hyponyms of gonad include ovary, ovotestis, ball, bollock, egg, nut, orchis, testicle, testis.

gonad (noun)	ballock (noun)
a gland in which gametes (sex cells) are produced	one of the two male reproductive glands that produce spermatozoa and secrete androgens