tendency vs tend

tendency is a noun but tend is not a noun.

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

tendency (noun)	tend (noun)
a characteristic likelihood of or natural disposition toward a certain condition or character or effect
an attitude of mind especially one that favors one alternative over others
an inclination to do something
a general direction in which something tends to move

tendency (verb)	tend (verb)
	have care of or look after
	manage or run
	have a tendency or disposition to do or be something; be inclined