surround vs hem in

surround is a noun but hem in is not a noun.

Word	Noun	Adjective	Verb	Adverb
surround	Yes	No	Yes	No
hem in	No	No	Yes	No

As verbs, surround and hem in are synonyms defined as:

Other synonyms of surround include beleaguer, besiege, circumvent.

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

Other hyponyms of surround include fringe, gird, girdle, cloister, close in, enclose, inclose, shut in, cloister.

surround (noun)	hem in (noun)
the area in which something exists or lives

surround (verb)	hem in (verb)
surround so as to force to give up	surround so as to force to give up
surround with a wall in order to fortify	surround in a restrictive manner
extend on all sides of simultaneously; encircle
envelop completely