dim vs efface

dim is an adjective but efface is not an adjective.

Word	Noun	Adjective	Verb	Adverb
dim	No	Yes	Yes	No
efface	No	No	Yes	No

As verbs, efface is a hyponym of dim; that is, efface is a word with a more specific, narrower meaning than dim:

Other hyponyms of dim include obliterate.

dim (adjective)	efface (adjective)
made dim or less bright
lacking in light; not bright or harsh
offering little or no hope
lacking clarity or distinctness
slow to learn or understand; lacking intellectual acuity

dim (verb)	efface (verb)
make dim or lusterless	remove completely from recognition or memory
become dim or lusterless	remove by or as if by rubbing or erasing
make dim by comparison or conceal	make inconspicuous
become vague or indistinct
switch (a car's headlights) from a higher to a lower beam