spermatozoan vs spermatozoon

spermatozoan and spermatozoon both are nouns.

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

As nouns, spermatozoan and spermatozoon are synonyms defined as:

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

Other synonyms of spermatozoan include sperm, sperm cell.

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