sperm count vs tally

sperm count and tally both are nouns.

Word	Noun	Adjective	Verb	Adverb
sperm count	Yes	No	No	No
tally	Yes	No	Yes	No

As nouns, tally is a hypernym of sperm count; that is, tally is a word with a broader meaning than sperm count:

sperm count: the act of estimating the number of spermatozoa in an ejaculate
tally: the act of counting; reciting numbers in ascending order

Other hypernyms of sperm count include count, counting, enumeration, numeration, reckoning.

sperm count (noun)	tally (noun)
the act of estimating the number of spermatozoa in an ejaculate	the act of counting; reciting numbers in ascending order
the number of sperm in an ejaculate	a score in baseball made by a runner touching all four bases safely
	a bill for an amount due

sperm count (verb)	tally (verb)
	determine the sum of
	keep score, as in games
	gain points in a game
	be compatible, similar or consistent; coincide in their characteristics