direction vs tendency

direction and tendency both are nouns.

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

As nouns, tendency is a hypernym of direction; that is, tendency is a word with a broader meaning than direction:

direction: a general course along which something has a tendency to develop
tendency: an attitude of mind especially one that favors one alternative over others

Other hypernyms of direction include disposition, inclination.

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

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

direction (noun)	tendency (noun)
the act of managing something	a characteristic likelihood of or natural disposition toward a certain condition or character or effect
the act of setting and holding a course	an attitude of mind especially one that favors one alternative over others
a general course along which something has a tendency to develop	an inclination to do something
the concentration of attention or energy on something	a general direction in which something tends to move
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