hem in vs seal off

hem in and seal off both are verbs.

Word	Noun	Adjective	Verb	Adverb
hem in	No	No	Yes	No
seal off	No	No	Yes	No

As verbs, seal off is a hyponym of hem in; that is, seal off is a word with a more specific, narrower meaning than hem in:

Other hyponyms of hem in include blockade, ebb.

hem in (verb)	seal off (verb)
surround so as to force to give up	impose a blockade on
surround in a restrictive manner	make tight; secure against leakage