suggestion vs ghost

suggestion and ghost both are nouns.

Word	Noun	Adjective	Verb	Adverb
suggestion	Yes	No	No	No
ghost	Yes	No	Yes	No

As nouns, ghost is a hyponym of suggestion; that is, ghost is a word with a more specific, narrower meaning than suggestion:

Other hyponyms of suggestion include breath, hint, intimation, touch, trace, advance, approach, feeler, overture.

suggestion (noun)	ghost (noun)
the act of inducing hypnosis	a mental representation of some haunting experience
an idea that is suggested	a suggestion of some quality
the sequential mental process in which one thought leads to another by association	the visible disembodied soul of a dead person
a proposal offered for acceptance or rejection	a writer who gives the credit of authorship to someone else
persuasion formulated as a suggestion
a just detectable amount