modal vs modal verb

modal and modal verb both are nouns.

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

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

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

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

modal (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

modal (adjective)	modal verb (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