reckon vs mathematics

reckon is not a noun while mathematics is a noun.

Word	Noun	Adjective	Verb	Adverb
reckon	No	No	Yes	No
mathematics	Yes	No	No	No

reckon (noun)	mathematics (noun)
	a science (or group of related sciences) dealing with the logic of quantity and shape and arrangement

reckon (verb)	mathematics (verb)
deem to be
make a mathematical calculation or computation
expect, believe, or suppose
judge to be probable
have faith or confidence in
take account of