normal vs modal

normal and modal both are nouns.

normal (noun)	modal (noun)
something regarded as a normative example	an auxiliary verb (such as `can' or `will') that is used to express modality

normal (adjective)	modal (adjective)
conforming with or constituting a norm or standard or level or type or social norm; not abnormal	relating to or constituting the most frequent value in a distribution
in accordance with scientific laws	of or relating to a musical mode; especially written in an ecclesiastical mode
being approximately average or within certain limits in e.g. intelligence and development	relating to or expressing the mood of a verb
forming a right angle