tendency vs disposition

tendency and disposition both are nouns.

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

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

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

As nouns, tendency and disposition are synonyms defined as:

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

Other synonyms of tendency include inclination.

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