feeling vs heart

feeling and heart both are nouns.

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

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

feeling (noun)	heart (noun)
the experiencing of affective and emotional states	a playing card in the major suit that has one or more red hearts on it
an intuitive understanding of something	the courage to carry on
a physical sensation that you experience	an inclination or tendency of a certain kind
the sensation produced by pressure receptors in the skin	the hollow muscular organ located behind the sternum and between the lungs; its rhythmic contractions move the blood through the body
a vague idea in which some confidence is placed	the locus of feelings and intuitions
the general atmosphere of a place or situation and the effect that it has on people	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