confine vs straiten

confine and straiten both are verbs.

Word	Noun	Adjective	Verb	Adverb
confine	No	No	Yes	No
straiten	No	No	Yes	No

As verbs, straiten is a hyponym of confine; that is, straiten is a word with a more specific, narrower meaning than confine:

confine (verb)	straiten (verb)
place limits on (extent or amount or access)	squeeze together
to close within bounds, or otherwise limit or deprive of free movement	bring into difficulties or distress, especially financial hardship
prevent from leaving or from being removed
deprive of freedom; take into confinement
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