count vs sperm count

count and sperm count both are nouns.

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

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

count: 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 count include blood count, census, nose count, nosecount, countdown, miscount, poll, recount.

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

count (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 nobleman (in various countries) having rank equal to a British earl	the number of sperm in an ejaculate
the total number counted

count (verb)	sperm count (verb)
include as if by counting
have faith or confidence in
take account of
determine the number or amount of
name or recite the numbers in ascending order
show consideration for; take into account
have weight; have import, carry weight
put into a group
have a certain value or carry a certain weight