confining vs limiting

confining is not a noun while limiting is a noun.

Word	Noun	Adjective	Verb	Adverb
confining	No	Yes	No	No
limiting	Yes	Yes	No	No

As adjectives, confining and limiting are synonyms defined as:

Other synonyms of confining include constraining, constrictive, restricting.

confining (noun)	limiting (noun)
	the grammatical relation that exists when a word qualifies the meaning of the phrase

confining (adjective)	limiting (adjective)
crowded	strictly limiting the reference of a modified word or phrase
restricting the scope or freedom of action	restricting the scope or freedom of action