gooney vs mollymawk

gooney and mollymawk both are nouns.

Word	Noun	Adjective	Verb	Adverb
gooney	Yes	No	No	No
mollymawk	Yes	No	No	No

As nouns, mollymawk is a hypernym of gooney; that is, mollymawk is a word with a broader meaning than gooney:

gooney: a variety of albatross with black feet
mollymawk: large web-footed birds of the Southern Hemisphere having long narrow wings; noted for powerful gliding flight

Other hypernyms of gooney include albatross.

gooney (noun)	mollymawk (noun)
a variety of albatross with black feet	large web-footed birds of the Southern Hemisphere having long narrow wings; noted for powerful gliding flight