testis vs bollock

testis and bollock both are nouns.

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

As nouns, testis and bollock are synonyms defined as:

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

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

testis (noun)	bollock (noun)
one of the two male reproductive glands that produce spermatozoa and secrete androgens	a pulley-block at the head of a topmast
	one of the two male reproductive glands that produce spermatozoa and secrete androgens