catch on vs comprehend

catch on and comprehend both are verbs.

Word	Noun	Adjective	Verb	Adverb
catch on	No	No	Yes	No
comprehend	No	No	Yes	No

As verbs, comprehend is a hypernym of catch on; that is, comprehend is a word with a broader meaning than catch on:

Other hypernyms of catch on include apprehend, compass, dig, get the picture, grasp, grok, savvy.

catch on (verb)	comprehend (verb)
become popular	get the meaning of something
understand, usually after some initial difficulty	to become aware of through the senses
	include in scope; include as part of something broader; have as one's sphere or territory