oldwife vs triggerfish

oldwife and triggerfish both are nouns.

Word	Noun	Adjective	Verb	Adverb
oldwife	Yes	No	No	No
triggerfish	Yes	No	No	No

As nouns, triggerfish is a hypernym of oldwife; that is, triggerfish is a word with a broader meaning than oldwife:

oldwife: tropical Atlantic fish
triggerfish: any of numerous compressed deep-bodied tropical fishes with sandpapery skin and erectile spines in the first dorsal fin

oldwife (noun)	triggerfish (noun)
tropical Atlantic fish	any of numerous compressed deep-bodied tropical fishes with sandpapery skin and erectile spines in the first dorsal fin
a common long-tailed sea duck of the northern parts of the United States