blot out vs obliterate

blot out is not an adjective while obliterate is an adjective.

Word	Noun	Adjective	Verb	Adverb
blot out	No	No	Yes	No
obliterate	No	Yes	Yes	No

As verbs, blot out and obliterate are synonyms defined as:

blot out and obliterate: make undecipherable or imperceptible by obscuring or concealing

Other synonyms of blot out include hide, obscure, veil.

blot out (adjective)	obliterate (adjective)
	reduced to nothingness

blot out (verb)	obliterate (verb)
make undecipherable or imperceptible by obscuring or concealing	remove completely from recognition or memory
	make undecipherable or imperceptible by obscuring or concealing
	mark for deletion, rub off, or erase
	do away with completely, without leaving a trace