modal auxiliary vs modal verb

modal auxiliary and modal verb both are nouns.

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

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

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

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

modal auxiliary (noun)	modal verb (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