therapsid vs synapsid reptile

therapsid and synapsid reptile both are nouns.

Word	Noun	Adjective	Verb	Adverb
therapsid	Yes	No	No	No
synapsid reptile	Yes	No	No	No

As nouns, synapsid reptile is a hypernym of therapsid; that is, synapsid reptile is a word with a broader meaning than therapsid:

therapsid: probably warm-blooded; considered direct ancestor of mammals
synapsid reptile: extinct reptile having a single pair of lateral temporal openings in the skull

Other hypernyms of therapsid include synapsid.

therapsid (noun)	synapsid reptile (noun)
probably warm-blooded; considered direct ancestor of mammals	extinct reptile having a single pair of lateral temporal openings in the skull