spermatozoon vs spermatozoan

spermatozoon and spermatozoan both are nouns.

Word	Noun	Adjective	Verb	Adverb
spermatozoon	Yes	No	No	No
spermatozoan	Yes	No	No	No

As nouns, spermatozoon and spermatozoan are synonyms defined as:

spermatozoon and spermatozoan: the male reproductive cell; the male gamete

Other synonyms of spermatozoon include sperm, sperm cell.

spermatozoon (noun)	spermatozoan (noun)
the male reproductive cell; the male gamete	the male reproductive cell; the male gamete