fissiparity vs agamogenesis

fissiparity and agamogenesis both are nouns.

Word	Noun	Adjective	Verb	Adverb
fissiparity	Yes	No	No	No
agamogenesis	Yes	No	No	No

As nouns, agamogenesis is a hypernym of fissiparity; that is, agamogenesis is a word with a broader meaning than fissiparity:

fissiparity: reproduction of some multicellular organisms by division, as in the case of some starfish
agamogenesis: reproduction without the fusion of gametes

Other hypernyms of fissiparity include asexual reproduction.

fissiparity (noun)	agamogenesis (noun)
the tendency to break into parts	reproduction without the fusion of gametes
reproduction of some multicellular organisms by division, as in the case of some starfish