frill vs frilly

frill is a noun but frilly is not a noun.

Word	Noun	Adjective	Verb	Adverb
frill	Yes	No	No	No
frilly	No	Yes	No	No

frill (noun)	frilly (noun)
a strip of pleated material used as a decoration or a trim
ornamental objects of no great value
an external body part consisting of feathers or hair about the neck of a bird or other animal
(paleontology) a bony plate that curves upward behind the skull of many ceratopsian dinosaurs

frill (adjective)	frilly (adjective)
	having decorative ruffles or frills