latch on vs catch on

latch on and catch on both are verbs.

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

As verbs, latch on and catch on are synonyms defined as:

latch on and catch on: understand, usually after some initial difficulty

Other synonyms of latch on include cotton on, get it, get onto, get wise, tumble, twig.

latch on (verb)	catch on (verb)
understand, usually after some initial difficulty	become popular
adopt	understand, usually after some initial difficulty
take hold of or attach to