testis vs ballock

testis and ballock both are nouns.

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

As nouns, testis and ballock are synonyms defined as:

testis and ballock: one of the two male reproductive glands that produce spermatozoa and secrete androgens

Other synonyms of testis include ball, bollock, egg, nut, orchis, testicle.

testis (noun)	ballock (noun)
one of the two male reproductive glands that produce spermatozoa and secrete androgens	one of the two male reproductive glands that produce spermatozoa and secrete androgens