portion vs distribute

portion is a noun but distribute is not a noun.

Word	Noun	Adjective	Verb	Adverb
portion	Yes	No	Yes	No
distribute	No	No	Yes	No

As verbs, distribute is a hypernym of portion; that is, distribute is a word with a broader meaning than portion:

Other hypernyms of portion include administer, allot, deal, deal out, dish out, dispense, dole out, lot, mete out, parcel out, shell out.

portion (noun)	distribute (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)	distribute (verb)
give out	cause to become widely known
	to arrange in a systematic order
	distribute or disperse widely
	cause to be distributed
	administer or bestow, as in small portions
	give to several people
	release
	be mathematically distributive
	be distributed or spread, as in statistical analyses
	spread throughout a given area