understand vs compass

understand is not a noun while compass is a noun.

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

As verbs, compass is a hyponym of understand; that is, compass is a word with a more specific, narrower meaning than understand:

understand (noun)	compass (noun)
	navigational instrument for finding directions
	drafting instrument used for drawing circles
	an area in which something acts or operates or has power or control:
	the limit of capability

understand (verb)	compass (verb)
know and comprehend the nature or meaning of	get the meaning of something
perceive (an idea or situation) mentally	travel around, either by plane or ship
believe to be the case	bring about; accomplish
make sense of a language
be understanding of