normal vs convention

normal and convention both are nouns.

Word	Noun	Adjective	Verb	Adverb
normal	Yes	Yes	No	No
convention	Yes	No	No	No

As nouns, normal and convention are synonyms defined as:

Other synonyms of normal include formula, pattern, rule.

normal (noun)	convention (noun)
something regarded as a normative example	the act of convening
	orthodoxy as a consequence of being conventional
	something regarded as a normative example
	(diplomacy) an international agreement
	a large formal assembly

normal (adjective)	convention (adjective)
conforming with or constituting a norm or standard or level or type or social norm; not abnormal
in accordance with scientific laws
being approximately average or within certain limits in e.g. intelligence and development
forming a right angle