big vs self-aggrandising

big and self-aggrandising both are adjectives.

Word	Noun	Adjective	Verb	Adverb
big	No	Yes	No	Yes
self-aggrandising	No	Yes	No	No

As adjectives, big and self-aggrandising are synonyms defined as:

Other synonyms of big include boastful, braggart, bragging, braggy, cock-a-hoop, crowing, self-aggrandizing.

big (adjective)	self-aggrandising (adjective)
above average in size or number or quantity or magnitude or extent	of or relating to or characteristic of self-aggrandizement
conspicuous in position or importance	exhibiting self-importance
given or giving freely
generous and understanding and tolerant
marked by intense physical force
significant
prodigious
serious or severe
loud and firm
(of animals) fully developed
in an advanced stage of pregnancy
feeling self-importance
exhibiting self-importance