blood count vs reckoning

blood count and reckoning both are nouns.

Word	Noun	Adjective	Verb	Adverb
blood count	Yes	No	No	No
reckoning	Yes	No	No	No

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

blood count: the act of estimating the number of red and white corpuscles in a blood sample
reckoning: the act of counting; reciting numbers in ascending order

Other hypernyms of blood count include count, counting, enumeration, numeration, tally.

blood count (noun)	reckoning (noun)
the act of estimating the number of red and white corpuscles in a blood sample	the act of counting; reciting numbers in ascending order
the number of red and white corpuscles in a blood sample	problem solving that involves numbers or quantities
	a bill for an amount due