family Cycadaceae vs cycad family

family Cycadaceae and cycad family both are nouns.

Word	Noun	Adjective	Verb	Adverb
family Cycadaceae	Yes	No	No	No
cycad family	Yes	No	No	No

As nouns, family Cycadaceae and cycad family are synonyms defined as:

family Cycadaceae and cycad family: ancient palmlike plants closely related to ferns in that fertilization is by means of spermatozoids

Other synonyms of family Cycadaceae include Cycadaceae.

family Cycadaceae (noun)	cycad family (noun)
ancient palmlike plants closely related to ferns in that fertilization is by means of spermatozoids	ancient palmlike plants closely related to ferns in that fertilization is by means of spermatozoids