scribble vs doodle

scribble and doodle both are nouns.

Word	Noun	Adjective	Verb	Adverb
scribble	Yes	No	Yes	No
doodle	Yes	No	Yes	No

As nouns, scribble and doodle are synonyms defined as:

Other synonyms of scribble include scrabble.

scribble (noun)	doodle (noun)
an aimless drawing	an aimless drawing
poor handwriting

scribble (verb)	doodle (verb)
write down quickly without much attention to detail	make a doodle; draw aimlessly
write carelessly