constituent vs portion

constituent and portion both are nouns.

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

As nouns, portion is a hypernym of constituent; that is, portion is a word with a broader meaning than constituent:

constituent: an artifact that is one of the individual parts of which a composite entity is made up; especially a part that can be separated from or attached to a system
portion: something less than the whole of a human artifact

Other hypernyms of constituent include part.

As nouns, constituent and portion are synonyms defined as:

constituent and portion: something determined in relation to something that includes it

Other synonyms of constituent include component, component part, part.

constituent (noun)	portion (noun)
an artifact that is one of the individual parts of which a composite entity is made up; especially a part that can be separated from or attached to a system	the allotment of some amount by dividing something
an abstract part of something	something less than the whole of a human artifact
(grammar) a word or phrase or clause forming part of a larger grammatical construction	an individual quantity of food or drink taken as part of a meal
a member of a constituency; a citizen who is represented in a government by officials for whom he or she votes	assets belonging to or due to or contributed by an individual person or group
something determined in relation to something that includes it	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)

constituent (adjective)	portion (adjective)
constitutional in the structure of something (especially your physical makeup)

constituent (verb)	portion (verb)
	give out