gall vs heartburning

gall and heartburning both are nouns.

Word	Noun	Adjective	Verb	Adverb
gall	Yes	No	Yes	No
heartburning	Yes	No	No	No

As nouns, heartburning is a hyponym of gall; that is, heartburning is a word with a more specific, narrower meaning than gall:

Other hyponyms of gall include huffishness, sulkiness, grievance, grudge, score, enviousness, envy.

gall (noun)	heartburning (noun)
the trait of being rude and impertinent; inclined to take liberties	intense resentment
a digestive juice secreted by the liver and stored in the gallbladder; aids in the digestion of fats
a feeling of deep and bitter anger and ill-will
abnormal swelling of plant tissue caused by insects or microorganisms or injury
a skin sore caused by chafing
an open sore on the back of a horse caused by ill-fitting or badly adjusted saddle

gall (verb)	heartburning (verb)
irritate or vex
become or make sore by or as if by rubbing