portrait vs characterisation

portrait and characterisation both are nouns.

Word	Noun	Adjective	Verb	Adverb
portrait	Yes	No	No	No
characterisation	Yes	No	No	No

As nouns, characterisation is a hypernym of portrait; that is, characterisation is a word with a broader meaning than portrait:

Other hypernyms of portrait include characterization, delineation, depiction, picture, word-painting, word picture.

portrait (noun)	characterisation (noun)
any likeness of a person, in any medium	a graphic or vivid verbal description
a word picture of a person's appearance and character	the act of describing distinctive characteristics or essential features