tending vs apt

tending is a noun but apt is not a noun.

Word	Noun	Adjective	Verb	Adverb
tending	Yes	Yes	No	No
apt	No	Yes	No	No

As adjectives, tending and apt are synonyms defined as:

Other synonyms of tending include disposed, given, minded.

tending (noun)	apt (noun)
the work of providing treatment for or attending to someone or something

tending (adjective)	apt (adjective)
(usually followed by `to') naturally disposed toward	being of striking appropriateness and pertinence
	(usually followed by `to') naturally disposed toward
	mentally quick and resourceful
	at risk of or subject to experiencing something usually unpleasant