indulge vs humor

indulge is not a noun while humor is a noun.

Word	Noun	Adjective	Verb	Adverb
indulge	No	No	Yes	No
humor	Yes	No	Yes	No

As verbs, humor is a hyponym of indulge; that is, humor is a word with a more specific, narrower meaning than indulge:

Other hyponyms of indulge include humour, spree, sow one's oats, sow one's wild oats.

indulge (noun)	humor (noun)
	the quality of being funny
	the trait of appreciating (and being able to express) the humorous
	the liquid parts of the body
	(Middle Ages) one of the four fluids in the body whose balance was believed to determine your emotional and physical state
	a message whose ingenuity or verbal skill or incongruity has the power to evoke laughter
	a characteristic (habitual or relatively temporary) state of feeling

indulge (verb)	humor (verb)
yield (to); give satisfaction to	put into a good mood
enjoy to excess
treat with excessive indulgence
give free rein to