spectre vs phantasm

spectre and phantasm both are nouns.

Word	Noun	Adjective	Verb	Adverb
spectre	Yes	No	No	No
phantasm	Yes	No	No	No

As nouns, phantasm is a hypernym of spectre; that is, phantasm is a word with a broader meaning than spectre:

Other hypernyms of spectre include apparition, fantasm, phantasma, phantom, shadow.

As nouns, spectre and phantasm are synonyms defined as:

Other synonyms of spectre include apparition, fantasm, phantasma, phantom, specter.

spectre (noun)	phantasm (noun)
a mental representation of some haunting experience	something existing in perception only
a ghostly appearing figure	a ghostly appearing figure