Cycad and Gymnosperm

Cycad noun - Any tropical gymnosperm of the order Cycadales; having unbranched stems with a crown of fernlike leaves.

Gymnosperm and cycad are semantically related. In some cases you can use "Gymnosperm" instead a noun "Cycad".

Gymnosperm noun - Plants of the class Gymnospermae having seeds not enclosed in an ovary.

Cycad and gymnosperm are semantically related. Sometimes you can replace term "Cycad" with "Gymnosperm", this nouns are similar.