direction vs heading

direction and heading both are nouns.

Word	Noun	Adjective	Verb	Adverb
direction	Yes	No	No	No
heading	Yes	No	No	No

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

direction: a line leading to a place or point
heading: the direction or path along which something moves or along which it lies

Other hyponyms of direction include aim, bearing, course, trend, east-west direction, north-south direction, qibla, tendency, trend.

direction (noun)	heading (noun)
the act of managing something	a horizontal (or nearly horizontal) passageway in a mine
the act of setting and holding a course	a line of text serving to indicate what the passage below it is about
a general course along which something has a tendency to develop	the direction or path along which something moves or along which it lies
the concentration of attention or energy on something
something that provides direction or advice as to a decision or course of action
a formal statement of a command or injunction to do something
a message describing how something is to be done
a line leading to a place or point
the spatial relation between something and the course along which it points or moves