disposition vs tendency

disposition and tendency both are nouns.

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

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

disposition: a natural or acquired habit or characteristic tendency in a person or thing
tendency: a characteristic likelihood of or natural disposition toward a certain condition or character or effect

Other hyponyms of disposition include aptness, propensity, mordacity, predisposition, proneness, separatism, inclination.

As nouns, disposition and tendency are synonyms defined as:

disposition and tendency: an attitude of mind especially one that favors one alternative over others

Other synonyms of disposition include inclination.

disposition (noun)	tendency (noun)
the act or means of getting rid of something	a characteristic likelihood of or natural disposition toward a certain condition or character or effect
your usual mood	an attitude of mind especially one that favors one alternative over others
a natural or acquired habit or characteristic tendency in a person or thing	an inclination to do something
an attitude of mind especially one that favors one alternative over others	a general direction in which something tends to move