portrayal vs semblance

portrayal and semblance both are nouns.

Word	Noun	Adjective	Verb	Adverb
portrayal	Yes	No	No	No
semblance	Yes	No	No	No

As nouns, semblance is a hypernym of portrayal; that is, semblance is a word with a broader meaning than portrayal:

Other hypernyms of portrayal include likeness.

portrayal (noun)	semblance (noun)
representation by drawing or painting etc	picture consisting of a graphic image of a person or thing
acting the part of a character on stage; dramatically representing the character by speech and action and gesture	an outward or token appearance or form that is deliberately misleading
any likeness of a person, in any medium	an erroneous mental representation
a representation by picture or portraiture
a word picture of a person's appearance and character