grad vs alumna

grad and alumna both are nouns.

Word	Noun	Adjective	Verb	Adverb
grad	Yes	No	No	No
alumna	Yes	No	No	No

As nouns, alumna is a hyponym of grad; that is, alumna is a word with a more specific, narrower meaning than grad:

grad: a person who has received a degree from a school (high school or college or university)
alumna: a female person who has received a degree from a school (high school or college or university)

Other hyponyms of grad include old boy, alumnus, Ivy Leaguer.

grad (noun)	alumna (noun)
a person who has received a degree from a school (high school or college or university)	a female person who has received a degree from a school (high school or college or university)
one-hundredth of a right angle