understand vs click

understand is not a noun while click is a noun.

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

understand (noun)	click (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

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