HND vs diploma

HND and diploma both are nouns.

Word	Noun	Adjective	Verb	Adverb
HND	Yes	No	No	No
diploma	Yes	No	No	No

As nouns, diploma is a hypernym of HND; that is, diploma is a word with a broader meaning than HND:

HND: a diploma given for vocational training that prepares the student for a career in a particular area; good students may progress to a course leading to a degree
diploma: a document certifying the successful completion of a course of study

Other hypernyms of HND include sheepskin.

HND (noun)	diploma (noun)
a diploma given for vocational training that prepares the student for a career in a particular area; good students may progress to a course leading to a degree	a document certifying the successful completion of a course of study