drusen vs plural form

drusen and plural form both are nouns.

Word	Noun	Adjective	Verb	Adverb
drusen	Yes	No	No	No
plural form	Yes	No	No	No

drusen (noun)	plural form (noun)
(plural) an eye disease resulting from small accumulations of hyaline bodies underneath the retina	the form of a word that is used to denote more than one