modal auxiliary vs modal

modal auxiliary and modal both are nouns.

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

As nouns, modal auxiliary and modal are synonyms defined as:

modal auxiliary and modal: an auxiliary verb (such as `can' or `will') that is used to express modality

Other synonyms of modal auxiliary include modal auxiliary verb, modal verb.

modal auxiliary (noun)	modal (noun)
an auxiliary verb (such as `can' or `will') that is used to express modality	an auxiliary verb (such as `can' or `will') that is used to express modality

modal auxiliary (adjective)	modal (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