click vs understand

click is a noun but understand is not a noun.

Word	Noun	Adjective	Verb	Adverb
click	Yes	No	Yes	No
understand	No	No	Yes	No

click (noun)	understand (noun)
depression of a button on a computer mouse
a hinged catch that fits into a notch of a ratchet to move a wheel forward or prevent it from moving backward
a stop consonant made by the suction of air into the mouth (as in Bantu)
a short light metallic sound

click (verb)	understand (verb)
become clear or enter one's consciousness or emotions	know and comprehend the nature or meaning of
make a clucking sounds, characteristic of hens	perceive (an idea or situation) mentally
produce a click	believe to be the case
cause to make a snapping sound	make sense of a language
move or strike with a noise	be understanding of
make a clicking or ticking sound
click repeatedly or uncontrollably