portion vs set aside

portion is a noun but set aside is not a noun.

Word	Noun	Adjective	Verb	Adverb
portion	Yes	No	Yes	No
set aside	No	No	Yes	No

As verbs, set aside is a hyponym of portion; that is, set aside is a word with a more specific, narrower meaning than portion:

Other hyponyms of portion include allow, appropriate, earmark, reserve, allocate, apportion.

portion (noun)	set aside (noun)
the allotment of some amount by dividing something
something less than the whole of a human artifact
an individual quantity of food or drink taken as part of a meal
assets belonging to or due to or contributed by an individual person or group
money or property brought by a woman to her husband at marriage
something determined in relation to something that includes it
your overall circumstances or condition in life (including everything that happens to you)

portion (verb)	set aside (verb)
give out	make inoperative or stop
	give or assign a resource to a particular person or cause
	annul (a legal decision)