disposition vs heart

disposition and heart both are nouns.

Word	Noun	Adjective	Verb	Adverb
disposition	Yes	No	No	No
heart	Yes	No	No	No

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

disposition (noun)	heart (noun)
the act or means of getting rid of something	a playing card in the major suit that has one or more red hearts on it
your usual mood	the courage to carry on
a natural or acquired habit or characteristic tendency in a person or thing	an inclination or tendency of a certain kind
an attitude of mind especially one that favors one alternative over others	the hollow muscular organ located behind the sternum and between the lungs; its rhythmic contractions move the blood through the body
	the locus of feelings and intuitions
	the choicest or most essential or most vital part of some idea or experience
	a positive feeling of liking
	a firm rather dry variety meat (usually beef or veal)
	an area that is approximately central within some larger region
	a plane figure with rounded sides curving inward at the top and intersecting at the bottom; conventionally used on playing cards and valentines