assonance vs assonant

assonance is a noun but assonant is not a noun.

Word	Noun	Adjective	Verb	Adverb
assonance	Yes	No	No	No
assonant	No	Yes	No	No

assonance (noun)	assonant (noun)
the repetition of similar vowels in the stressed syllables of successive words

assonance (adjective)	assonant (adjective)
	having the same vowel sound occurring with different consonants in successive words or stressed syllables
	having the same sound (especially the same vowel sound) occurring in successive stressed syllables