ceratozamia vs cycad

ceratozamia and cycad both are nouns.

Word	Noun	Adjective	Verb	Adverb
ceratozamia	Yes	No	No	No
cycad	Yes	No	No	No

As nouns, cycad is a hypernym of ceratozamia; that is, cycad is a word with a broader meaning than ceratozamia:

ceratozamia: a small cycad of the genus Ceratozamia having a short scaly woody trunk and fernlike foliage and woody cones; Mexico
cycad: any tropical gymnosperm of the order Cycadales; having unbranched stems with a crown of fernlike leaves

ceratozamia (noun)	cycad (noun)
a small cycad of the genus Ceratozamia having a short scaly woody trunk and fernlike foliage and woody cones; Mexico	any tropical gymnosperm of the order Cycadales; having unbranched stems with a crown of fernlike leaves