blow dryer vs dryer

blow dryer and dryer both are nouns.

Word	Noun	Adjective	Verb	Adverb
blow dryer	Yes	No	No	No
dryer	Yes	No	No	No

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

blow dryer: a hand-held electric blower that can blow warm air onto the hair; used for styling hair
dryer: an appliance that removes moisture

Other hypernyms of blow dryer include blower, drier.

blow dryer (noun)	dryer (noun)
a hand-held electric blower that can blow warm air onto the hair; used for styling hair	an appliance that removes moisture