clothes dryer vs drier

clothes dryer and drier both are nouns.

Word	Noun	Adjective	Verb	Adverb
clothes dryer	Yes	No	No	No
drier	Yes	No	No	No

As nouns, drier is a hypernym of clothes dryer; that is, drier is a word with a broader meaning than clothes dryer:

Other hypernyms of clothes dryer include dryer, white goods.

clothes dryer (noun)	drier (noun)
a dryer that dries clothes wet from washing	an appliance that removes moisture
	a substance that promotes drying (e.g., calcium oxide absorbs water and is used to remove moisture)