sperm cell vs gamete

sperm cell and gamete both are nouns.

Word	Noun	Adjective	Verb	Adverb
sperm cell	Yes	No	No	No
gamete	Yes	No	No	No

As nouns, gamete is a hypernym of sperm cell; that is, gamete is a word with a broader meaning than sperm cell:

sperm cell: the male reproductive cell; the male gamete
gamete: a mature sexual reproductive cell having a single set of unpaired chromosomes

sperm cell (noun)	gamete (noun)
the male reproductive cell; the male gamete	a mature sexual reproductive cell having a single set of unpaired chromosomes