spermatid

As nouns the difference between haploid and spermatid

is that haploid is a cell which is haploid while spermatid is (biology) a haploid cell, produced by meiosis of a spermatocyte, that develops into a spermatozoon.

As an adjective haploid

is (cytology) of a cell having a single set of unpaired chromosomes, such as a gamete.