choke off vs silt up

choke off and silt up both are verbs.

Word	Noun	Adjective	Verb	Adverb
choke off	No	No	Yes	No
silt up	No	No	Yes	No

As verbs, silt up is a hyponym of choke off; that is, silt up is a word with a more specific, narrower meaning than choke off:

Other hyponyms of choke off include gum up, block, choke up, lug, stuff, silt.

choke off (verb)	silt up (verb)
suppress	become chocked with silt
become or cause to become obstructed