phantom limb vs semblance

phantom limb and semblance both are nouns.

Word	Noun	Adjective	Verb	Adverb
phantom limb	Yes	No	No	No
semblance	Yes	No	No	No

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

phantom limb: the illusion that a limb still exists after it has been amputated
semblance: an erroneous mental representation

Other hypernyms of phantom limb include illusion.

phantom limb (noun)	semblance (noun)
the illusion that a limb still exists after it has been amputated	picture consisting of a graphic image of a person or thing
	an outward or token appearance or form that is deliberately misleading
	an erroneous mental representation