tally vs sperm count

tally and sperm count both are nouns.

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

As nouns, sperm count is a hyponym of tally; that is, sperm count is a word with a more specific, narrower meaning than tally:

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

Other hyponyms of tally include blood count, census, nose count, nosecount, countdown, miscount, poll, recount.

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

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