modal vs modality

modal and modality both are nouns.

Word	Noun	Adjective	Verb	Adverb
modal	Yes	Yes	No	No
modality	Yes	No	No	No

modal (noun)	modality (noun)
an auxiliary verb (such as `can' or `will') that is used to express modality	a method of therapy that involves physical or electrical therapeutic treatment
	a particular sense
	a classification of propositions on the basis of whether they claim necessity or possibility or impossibility
	verb inflections that express how the action or state is conceived by the speaker

modal (adjective)	modality (adjective)
relating to or expressing the mood of a verb
of or relating to a musical mode; especially written in an ecclesiastical mode
relating to or constituting the most frequent value in a distribution