Mola lanceolata vs headfish

Mola lanceolata and headfish both are nouns.

Word	Noun	Adjective	Verb	Adverb
Mola lanceolata	Yes	No	No	No
headfish	Yes	No	No	No

As nouns, headfish is a hypernym of Mola lanceolata; that is, headfish is a word with a broader meaning than Mola lanceolata:

Mola lanceolata: caudal fin has a central projection
headfish: among the largest bony fish; pelagic fish having an oval compressed body with high dorsal and anal fins and caudal fin reduced to a rudder-like lobe; worldwide in warm waters

Other hypernyms of Mola lanceolata include mola, ocean sunfish, sunfish.

Mola lanceolata (noun)	headfish (noun)
caudal fin has a central projection	among the largest bony fish; pelagic fish having an oval compressed body with high dorsal and anal fins and caudal fin reduced to a rudder-like lobe; worldwide in warm waters