nonachiever vs student

nonachiever and student both are nouns.

Word	Noun	Adjective	Verb	Adverb
nonachiever	Yes	No	No	No
student	Yes	No	No	No

As nouns, student is a hypernym of nonachiever; that is, student is a word with a broader meaning than nonachiever:

nonachiever: a student who does not perform as well as expected or as well as the IQ indicates
student: a learner who is enrolled in an educational institution

Other hypernyms of nonachiever include educatee, pupil.

nonachiever (noun)	student (noun)
a student who does not perform as well as expected or as well as the IQ indicates	a learner who is enrolled in an educational institution
	someone (especially a child) who learns (as from a teacher) or takes up knowledge or beliefs